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13220120312 = 2371713886681
BaseRepresentation
bin11000100111111101…
…10000011011111000
31021010022222200202122
430103332300123320
5204033322322222
610023453020412
7645415111550
oct142376603370
937108880678
1013220120312
115674460073
12268b484708
131328b820c9
148d5aa8160
15525932a42
hex313fb06f8

13220120312 has 32 divisors (see below), whose sum is σ = 29995233120. Its totient is φ = 5332485120.

The previous prime is 13220120279. The next prime is 13220120317. The reversal of 13220120312 is 21302102231.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220120317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6942389 + ... + 6944292.

It is an arithmetic number, because the mean of its divisors is an integer number (937351035).

Almost surely, 213220120312 is an apocalyptic number.

It is an amenable number.

13220120312 is an abundant number, since it is smaller than the sum of its proper divisors (16775112808).

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

13220120312 is a wasteful number, since it uses less digits than its factorization.

13220120312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13886711 (or 13886707 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 13220120312 its reverse (21302102231), we get a palindrome (34522222543).

The spelling of 13220120312 in words is "thirteen billion, two hundred twenty million, one hundred twenty thousand, three hundred twelve".

Divisors: 1 2 4 7 8 14 17 28 34 56 68 119 136 238 476 952 13886681 27773362 55546724 97206767 111093448 194413534 236073577 388827068 472147154 777654136 944294308 1652515039 1888588616 3305030078 6610060156 13220120312