20531444520 has 32 divisors (see below), whose sum is σ = 61594333920. Its totient is φ = 5475051840.

The previous prime is 20531444509. The next prime is 20531444533. The reversal of 20531444520 is 2544413502.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 85547566 + ... + 85547805.

It is an arithmetic number, because the mean of its divisors is an integer number (1924822935).

Almost surely, 2^20531444520 is an apocalyptic number.

20531444520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20531444520 is an abundant number, since it is smaller than the sum of its proper divisors (41062889400).

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

20531444520 is a wasteful number, since it uses less digits than its factorization.

20531444520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171095385 (or 171095381 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The spelling of 20531444520 in words is "twenty billion, five hundred thirty-one million, four hundred forty-four thousand, five hundred twenty".