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20879870256 = 243574631657
BaseRepresentation
bin10011011100100010…
…011000100100110000
31222220011011022100000
4103130202120210300
5320230221322011
613331520030000
71336264653210
oct233442304460
958804138300
1020879870256
118945162623
124068762300
131c79a73b1b
1410210c2240
1582311d356
hex4dc898930

20879870256 has 240 divisors, whose sum is σ = 69447332864. Its totient is φ = 5949199872.

The previous prime is 20879870227. The next prime is 20879870257. The reversal of 20879870256 is 65207897802.

It is a happy number.

It is a super-3 number, since 3×208798702563 (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (20879870257) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12600180 + ... + 12601836.

Almost surely, 220879870256 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 20879870256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34723666432).

20879870256 is an abundant number, since it is smaller than the sum of its proper divisors (48567462608).

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

20879870256 is a wasteful number, since it uses less digits than its factorization.

20879870256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2150 (or 2132 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The spelling of 20879870256 in words is "twenty billion, eight hundred seventy-nine million, eight hundred seventy thousand, two hundred fifty-six".