20151815180 has 48 divisors (see below), whose sum is σ = 48384388416. Its totient is φ = 6906332160.

The previous prime is 20151815149. The next prime is 20151815183. The reversal of 20151815180 is 8151815102.

It is not an unprimeable number, because it can be changed into a prime (20151815183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 324392 + ... + 381488.

It is an arithmetic number, because the mean of its divisors is an integer number (1008008092).

Almost surely, 2^20151815180 is an apocalyptic number.

20151815180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20151815180 is an abundant number, since it is smaller than the sum of its proper divisors (28232573236).

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

20151815180 is a wasteful number, since it uses less digits than its factorization.

20151815180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59634 (or 59632 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 32.

The spelling of 20151815180 in words is "twenty billion, one hundred fifty-one million, eight hundred fifteen thousand, one hundred eighty".