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20685015296 = 28117519781
BaseRepresentation
bin10011010000111011…
…000100100100000000
31222101120111122120122
4103100323010210000
5314330330442141
613300315355412
71331410505021
oct232073044400
958346448518
1020685015296
118855174170
124013452b68
131c4859b62a
14100327cc48
15810e7d64b
hex4d0ec4900

20685015296 has 72 divisors (see below), whose sum is σ = 45107384448. Its totient is φ = 9388800000.

The previous prime is 20685015287. The next prime is 20685015301. The reversal of 20685015296 is 69251058602.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2109926 + ... + 2119706.

Almost surely, 220685015296 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20685015296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22553692224).

20685015296 is an abundant number, since it is smaller than the sum of its proper divisors (24422369152).

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

20685015296 is an equidigital number, since it uses as much as digits as its factorization.

20685015296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10559 (or 10545 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 44.

The spelling of 20685015296 in words is "twenty billion, six hundred eighty-five million, fifteen thousand, two hundred ninety-six".

Divisors: 1 2 4 8 11 16 22 32 44 64 88 128 176 256 352 704 751 1408 1502 2816 3004 6008 8261 9781 12016 16522 19562 24032 33044 39124 48064 66088 78248 96128 107591 132176 156496 192256 215182 264352 312992 430364 528704 625984 860728 1057408 1251968 1721456 2114816 2503936 3442912 6885824 7345531 13771648 14691062 27543296 29382124 58764248 80800841 117528496 161601682 235056992 323203364 470113984 646406728 940227968 1292813456 1880455936 2585626912 5171253824 10342507648 20685015296