20525344521 has 32 divisors (see below), whose sum is σ = 30339854208. Its totient is φ = 12239216640.

The previous prime is 20525344513. The next prime is 20525344549. The reversal of 20525344521 is 12544352502.

It is a happy number.

It is not a de Polignac number, because 20525344521 - 2³ = 20525344513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (20525344501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 490785 + ... + 530961.

It is an arithmetic number, because the mean of its divisors is an integer number (948120444).

Almost surely, 2^20525344521 is an apocalyptic number.

It is an amenable number.

20525344521 is a deficient number, since it is larger than the sum of its proper divisors (9814509687).

20525344521 is a wasteful number, since it uses less digits than its factorization.

20525344521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40441.

The product of its (nonzero) digits is 48000, while the sum is 33.

The spelling of 20525344521 in words is "twenty billion, five hundred twenty-five million, three hundred forty-four thousand, five hundred twenty-one".