220660900 has 36 divisors (see below), whose sum is σ = 485593920. Its totient is φ = 87018400.

The previous prime is 220660879. The next prime is 220660943. The reversal of 220660900 is 9066022.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8440 + ... + 22639.

It is an arithmetic number, because the mean of its divisors is an integer number (13488720).

Almost surely, 2^220660900 is an apocalyptic number.

220660900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220660900 is an abundant number, since it is smaller than the sum of its proper divisors (264933020).

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

220660900 is a wasteful number, since it uses less digits than its factorization.

220660900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31164 (or 31157 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 220660900 is about 14854.6592017454. The cubic root of 220660900 is about 604.2849736346.

The spelling of 220660900 in words is "two hundred twenty million, six hundred sixty thousand, nine hundred".