20730560 has 28 divisors (see below), whose sum is σ = 49365408. Its totient is φ = 8292096.

The previous prime is 20730551. The next prime is 20730569. The reversal of 20730560 is 6503702.

It is an interprime number because it is at equal distance from previous prime (20730551) and next prime (20730569).

It is a super-2 number, since 2×20730560² = 859512235827200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20730569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32072 + ... + 32711.

Almost surely, 2^20730560 is an apocalyptic number.

20730560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20730560 is an abundant number, since it is smaller than the sum of its proper divisors (28634848).

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

20730560 is an equidigital number, since it uses as much as digits as its factorization.

20730560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64800 (or 64790 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 20730560 is about 4553.0824723477. The cubic root of 20730560 is about 274.7073912447.

The spelling of 20730560 in words is "twenty million, seven hundred thirty thousand, five hundred sixty".