220645560 has 64 divisors (see below), whose sum is σ = 662942880. Its totient is φ = 58749440.

The previous prime is 220645553. The next prime is 220645561. The reversal of 220645560 is 65546022.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220645561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126454 + ... + 128186.

Almost surely, 2^220645560 is an apocalyptic number.

220645560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220645560 is an abundant number, since it is smaller than the sum of its proper divisors (442297320).

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

220645560 is a wasteful number, since it uses less digits than its factorization.

220645560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2808 (or 2804 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 220645560 is about 14854.1428564559. The cubic root of 220645560 is about 604.2709703286.

The spelling of 220645560 in words is "two hundred twenty million, six hundred forty-five thousand, five hundred sixty".