20815946860 has 24 divisors (see below), whose sum is σ = 43718724000. Its totient is φ = 8325381504.

The previous prime is 20815946857. The next prime is 20815946897. The reversal of 20815946860 is 6864951802.

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, 122152 + ... + 237808.

It is an arithmetic number, because the mean of its divisors is an integer number (1821613500).

Almost surely, 2^20815946860 is an apocalyptic number.

20815946860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20815946860 is an abundant number, since it is smaller than the sum of its proper divisors (22902777140).

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

20815946860 is a wasteful number, since it uses less digits than its factorization.

20815946860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124665 (or 124663 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 49.

The spelling of 20815946860 in words is "twenty billion, eight hundred fifteen million, nine hundred forty-six thousand, eight hundred sixty".