20565517152 has 48 divisors (see below), whose sum is σ = 54036702720. Its totient is φ = 6848541312.

The previous prime is 20565517123. The next prime is 20565517199. The reversal of 20565517152 is 25171556502.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×20565517152² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20565517152.

It is a congruent number.

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, 3348 + ... + 202835.

It is an arithmetic number, because the mean of its divisors is an integer number (1125764640).

Almost surely, 2^20565517152 is an apocalyptic number.

It is an amenable number.

20565517152 is an abundant number, since it is smaller than the sum of its proper divisors (33471185568).

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

20565517152 is a wasteful number, since it uses less digits than its factorization.

20565517152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207235 (or 207227 counting only the distinct ones).

The product of its (nonzero) digits is 105000, while the sum is 39.

The spelling of 20565517152 in words is "twenty billion, five hundred sixty-five million, five hundred seventeen thousand, one hundred fifty-two".