20178940220 has 24 divisors (see below), whose sum is σ = 42431784864. Its totient is φ = 8060907456.

The previous prime is 20178940169. The next prime is 20178940259. The reversal of 20178940220 is 2204987102.

It is a congruent number.

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, 651272 + ... + 681551.

It is an arithmetic number, because the mean of its divisors is an integer number (1767991036).

Almost surely, 2^20178940220 is an apocalyptic number.

20178940220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20178940220 is an abundant number, since it is smaller than the sum of its proper divisors (22252844644).

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

20178940220 is a wasteful number, since it uses less digits than its factorization.

20178940220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333589 (or 1333587 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The spelling of 20178940220 in words is "twenty billion, one hundred seventy-eight million, nine hundred forty thousand, two hundred twenty".