20750881536 has 576 divisors, whose sum is σ = 77359349760. Its totient is φ = 5329981440.

The previous prime is 20750881511. The next prime is 20750881549. The reversal of 20750881536 is 63518805702.

It is a tau number, because it is divible by the number of its divisors (576).

It is a super-2 number, since 2×20750881536² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20750881491 and 20750881500.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 67592295 + ... + 67592601.

Almost surely, 2^20750881536 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 20750881536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38679674880).

20750881536 is an abundant number, since it is smaller than the sum of its proper divisors (56608468224).

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

20750881536 is a wasteful number, since it uses less digits than its factorization.

20750881536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477 (or 457 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The spelling of 20750881536 in words is "twenty billion, seven hundred fifty million, eight hundred eighty-one thousand, five hundred thirty-six".