20055660 has 24 divisors (see below), whose sum is σ = 56156016. Its totient is φ = 5348160.

The previous prime is 20055649. The next prime is 20055661. The reversal of 20055660 is 6655002.

It is a self number, because there is not a number n which added to its sum of digits gives 20055660.

It is not an unprimeable number, because it can be changed into a prime (20055661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167071 + ... + 167190.

It is an arithmetic number, because the mean of its divisors is an integer number (2339834).

Almost surely, 2^20055660 is an apocalyptic number.

20055660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20055660 is an abundant number, since it is smaller than the sum of its proper divisors (36100356).

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

20055660 is a wasteful number, since it uses less digits than its factorization.

20055660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334273 (or 334271 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 20055660 is about 4478.3546085588. The cubic root of 20055660 is about 271.6933359008.

The spelling of 20055660 in words is "twenty million, fifty-five thousand, six hundred sixty".