20637561120 has 96 divisors (see below), whose sum is σ = 70918182720. Its totient is φ = 5003043840.

The previous prime is 20637561097. The next prime is 20637561181. The reversal of 20637561120 is 2116573602.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1949035 + ... + 1959594.

It is an arithmetic number, because the mean of its divisors is an integer number (738731070).

Almost surely, 2^20637561120 is an apocalyptic number.

20637561120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20637561120 is an abundant number, since it is smaller than the sum of its proper divisors (50280621600).

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

20637561120 is a wasteful number, since it uses less digits than its factorization.

20637561120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3908658 (or 3908650 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The spelling of 20637561120 in words is "twenty billion, six hundred thirty-seven million, five hundred sixty-one thousand, one hundred twenty".