20478272220 has 72 divisors (see below), whose sum is σ = 70991348064. Its totient is φ = 4680747648.

The previous prime is 20478272209. The next prime is 20478272279. The reversal of 20478272220 is 2227287402.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8125039 + ... + 8127558.

Almost surely, 2^20478272220 is an apocalyptic number.

20478272220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20478272220 is an abundant number, since it is smaller than the sum of its proper divisors (50513075844).

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

20478272220 is a wasteful number, since it uses less digits than its factorization.

20478272220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16252619 (or 16252614 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 36.

The spelling of 20478272220 in words is "twenty billion, four hundred seventy-eight million, two hundred seventy-two thousand, two hundred twenty".