20031537605 has 4 divisors (see below), whose sum is σ = 24037845132. Its totient is φ = 16025230080.

The previous prime is 20031537583. The next prime is 20031537677. The reversal of 20031537605 is 50673513002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15794959684 + 4236577921 = 125678^2 + 65089^2 .

It is not a de Polignac number, because 20031537605 - 2⁸ = 20031537349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2003153756 + ... + 2003153765.

It is an arithmetic number, because the mean of its divisors is an integer number (6009461283).

Almost surely, 2^20031537605 is an apocalyptic number.

It is an amenable number.

20031537605 is a deficient number, since it is larger than the sum of its proper divisors (4006307527).

20031537605 is an equidigital number, since it uses as much as digits as its factorization.

20031537605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4006307526.

The product of its (nonzero) digits is 18900, while the sum is 32.

The spelling of 20031537605 in words is "twenty billion, thirty-one million, five hundred thirty-seven thousand, six hundred five".