20531521304 has 16 divisors (see below), whose sum is σ = 43996117200. Its totient is φ = 8799223392.

The previous prime is 20531521301. The next prime is 20531521321. The reversal of 20531521304 is 40312513502.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20531521301) 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, 183317099 + ... + 183317210.

It is an arithmetic number, because the mean of its divisors is an integer number (2749757325).

Almost surely, 2^20531521304 is an apocalyptic number.

It is an amenable number.

20531521304 is an abundant number, since it is smaller than the sum of its proper divisors (23464595896).

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

20531521304 is a wasteful number, since it uses less digits than its factorization.

20531521304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366634322 (or 366634318 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The spelling of 20531521304 in words is "twenty billion, five hundred thirty-one million, five hundred twenty-one thousand, three hundred four".