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20312313012220 = 22531151216965531
BaseRepresentation
bin1001001111001010101000…
…01100111001111111111100
32122220211122000111100210111
410213211110030321333330
510130244104112342340
6111111203041515404
74164342023564125
oct447452414717774
978824560440714
1020312313012220
116521449177699
1223407b4642b64
13b4459b07c898
1450319a7bb04c
152535834e4aea
hex127954339ffc

20312313012220 has 48 divisors (see below), whose sum is σ = 44323454601216. Its totient is φ = 7810759080000.

The previous prime is 20312313012197. The next prime is 20312313012227. The reversal of 20312313012220 is 2221031321302.

It is a junction number, because it is equal to n+sod(n) for n = 20312313012191 and 20312313012200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312313012227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108389146 + ... + 108576385.

It is an arithmetic number, because the mean of its divisors is an integer number (923405304192).

Almost surely, 220312313012220 is an apocalyptic number.

20312313012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20312313012220 is an abundant number, since it is smaller than the sum of its proper divisors (24011141588996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20312313012220 is a wasteful number, since it uses less digits than its factorization.

20312313012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216965722 (or 216965720 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 20312313012220 its reverse (2221031321302), we get a palindrome (22533344333522).

The spelling of 20312313012220 in words is "twenty trillion, three hundred twelve billion, three hundred thirteen million, twelve thousand, two hundred twenty".

Divisors: 1 2 4 5 10 20 31 62 124 151 155 302 310 604 620 755 1510 3020 4681 9362 18724 23405 46810 93620 216965531 433931062 867862124 1084827655 2169655310 4339310620 6725931461 13451862922 26903725844 32761795181 33629657305 65523590362 67259314610 131047180724 134518629220 163808975905 327617951810 655235903620 1015615650611 2031231301222 4062462602444 5078078253055 10156156506110 20312313012220