20951938220 has 24 divisors (see below), whose sum is σ = 44191215600. Its totient is φ = 8344176192.

The previous prime is 20951938207. The next prime is 20951938283. The reversal of 20951938220 is 2283915902.

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, 2282750 + ... + 2291909.

It is an arithmetic number, because the mean of its divisors is an integer number (1841300650).

Almost surely, 2^20951938220 is an apocalyptic number.

20951938220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20951938220 is an abundant number, since it is smaller than the sum of its proper divisors (23239277380).

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

20951938220 is a wasteful number, since it uses less digits than its factorization.

20951938220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4574897 (or 4574895 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 41.

The spelling of 20951938220 in words is "twenty billion, nine hundred fifty-one million, nine hundred thirty-eight thousand, two hundred twenty".