20718560 has 24 divisors (see below), whose sum is σ = 48947976. Its totient is φ = 8287360.

The previous prime is 20718547. The next prime is 20718583. The reversal of 20718560 is 6581702.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 64586 + ... + 64905.

It is an arithmetic number, because the mean of its divisors is an integer number (2039499).

Almost surely, 2^20718560 is an apocalyptic number.

20718560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20718560 is an abundant number, since it is smaller than the sum of its proper divisors (28229416).

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

20718560 is a wasteful number, since it uses less digits than its factorization.

20718560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129506 (or 129498 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 20718560 is about 4551.7644930290. The cubic root of 20718560 is about 274.6543757133.

The spelling of 20718560 in words is "twenty million, seven hundred eighteen thousand, five hundred sixty".