20955860 has 24 divisors (see below), whose sum is σ = 46324320. Its totient is φ = 7941024.

The previous prime is 20955853. The next prime is 20955871. The reversal of 20955860 is 6855902.

It is a self number, because there is not a number n which added to its sum of digits gives 20955860.

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, 27194 + ... + 27953.

It is an arithmetic number, because the mean of its divisors is an integer number (1930180).

Almost surely, 2^20955860 is an apocalyptic number.

20955860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20955860 is an abundant number, since it is smaller than the sum of its proper divisors (25368460).

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

20955860 is a wasteful number, since it uses less digits than its factorization.

20955860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55175 (or 55173 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 20955860 is about 4577.7570927257. The cubic root of 20955860 is about 275.6989821850.

The spelling of 20955860 in words is "twenty million, nine hundred fifty-five thousand, eight hundred sixty".