220390660 has 24 divisors (see below), whose sum is σ = 528937920. Its totient is φ = 75562464.

The previous prime is 220390657. The next prime is 220390663. The reversal of 220390660 is 66093022.

It is an interprime number because it is at equal distance from previous prime (220390657) and next prime (220390663).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (220390663) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 786970 + ... + 787249.

It is an arithmetic number, because the mean of its divisors is an integer number (22039080).

Almost surely, 2^220390660 is an apocalyptic number.

220390660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220390660 is an abundant number, since it is smaller than the sum of its proper divisors (308547260).

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

220390660 is a wasteful number, since it uses less digits than its factorization.

220390660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1574235 (or 1574233 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 220390660 is about 14845.5602790868. The cubic root of 220390660 is about 604.0381867002.

The spelling of 220390660 in words is "two hundred twenty million, three hundred ninety thousand, six hundred sixty".