20660540 has 12 divisors (see below), whose sum is σ = 43387176. Its totient is φ = 8264208.

The previous prime is 20660527. The next prime is 20660567. The reversal of 20660540 is 4506602.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 516494 + ... + 516533.

It is an arithmetic number, because the mean of its divisors is an integer number (3615598).

Almost surely, 2^20660540 is an apocalyptic number.

20660540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20660540 is an abundant number, since it is smaller than the sum of its proper divisors (22726636).

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

20660540 is a wasteful number, since it uses less digits than its factorization.

20660540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033036 (or 1033034 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20660540 is about 4545.3866722205. The cubic root of 20660540 is about 274.3977564437.

The spelling of 20660540 in words is "twenty million, six hundred sixty thousand, five hundred forty".