20680540 has 12 divisors (see below), whose sum is σ = 43429176. Its totient is φ = 8272208.

The previous prime is 20680501. The next prime is 20680571. The reversal of 20680540 is 4508602.

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, 516994 + ... + 517033.

It is an arithmetic number, because the mean of its divisors is an integer number (3619098).

Almost surely, 2^20680540 is an apocalyptic number.

20680540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20680540 is an abundant number, since it is smaller than the sum of its proper divisors (22748636).

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

20680540 is a wasteful number, since it uses less digits than its factorization.

20680540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1034036 (or 1034034 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 20680540 is about 4547.5861729054. The cubic root of 20680540 is about 274.4862695424.

The spelling of 20680540 in words is "twenty million, six hundred eighty thousand, five hundred forty".