20815732160 has 28 divisors (see below), whose sum is σ = 49567462968. Its totient is φ = 8326292736.

The previous prime is 20815732111. The next prime is 20815732177. The reversal of 20815732160 is 6123751802.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20815732160.

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, 32524262 + ... + 32524901.

Almost surely, 2^20815732160 is an apocalyptic number.

20815732160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20815732160 is an abundant number, since it is smaller than the sum of its proper divisors (28751730808).

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

20815732160 is an equidigital number, since it uses as much as digits as its factorization.

20815732160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65049180 (or 65049170 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The spelling of 20815732160 in words is "twenty billion, eight hundred fifteen million, seven hundred thirty-two thousand, one hundred sixty".