20815356604 has 36 divisors (see below), whose sum is σ = 42434847000. Its totient is φ = 8908082400.

The previous prime is 20815356589. The next prime is 20815356619. The reversal of 20815356604 is 40665351802.

It is an interprime number because it is at equal distance from previous prime (20815356589) and next prime (20815356619).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61647 + ... + 213145.

It is an arithmetic number, because the mean of its divisors is an integer number (1178745750).

Almost surely, 2^20815356604 is an apocalyptic number.

It is an amenable number.

20815356604 is an abundant number, since it is smaller than the sum of its proper divisors (21619490396).

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

20815356604 is a wasteful number, since it uses less digits than its factorization.

20815356604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152218 (or 152209 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 20815356604 in words is "twenty billion, eight hundred fifteen million, three hundred fifty-six thousand, six hundred four".