20516525472 has 24 divisors (see below), whose sum is σ = 53855879616. Its totient is φ = 6838841792.

The previous prime is 20516525461. The next prime is 20516525473. The reversal of 20516525472 is 27452561502.

It is a tau number, because it is divible by the number of its divisors (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20516525472.

It is not an unprimeable number, because it can be changed into a prime (20516525473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106856808 + ... + 106856999.

It is an arithmetic number, because the mean of its divisors is an integer number (2243994984).

Almost surely, 2^20516525472 is an apocalyptic number.

It is an amenable number.

20516525472 is an abundant number, since it is smaller than the sum of its proper divisors (33339354144).

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

20516525472 is a wasteful number, since it uses less digits than its factorization.

20516525472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213713820 (or 213713812 counting only the distinct ones).

The product of its (nonzero) digits is 168000, while the sum is 39.

The spelling of 20516525472 in words is "twenty billion, five hundred sixteen million, five hundred twenty-five thousand, four hundred seventy-two".