20431527564 has 96 divisors (see below), whose sum is σ = 57410375680. Its totient is φ = 5524676928.

The previous prime is 20431527553. The next prime is 20431527637. The reversal of 20431527564 is 46572513402.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1690527 + ... + 1702569.

Almost surely, 2^20431527564 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20431527564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28705187840).

20431527564 is an abundant number, since it is smaller than the sum of its proper divisors (36978848116).

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

20431527564 is a wasteful number, since it uses less digits than its factorization.

20431527564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13139 (or 13137 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 39.

The spelling of 20431527564 in words is "twenty billion, four hundred thirty-one million, five hundred twenty-seven thousand, five hundred sixty-four".