20680939 has 6 divisors (see below), whose sum is σ = 20831276. Its totient is φ = 20531640.

The previous prime is 20680931. The next prime is 20680943. The reversal of 20680939 is 93908602.

It is not a de Polignac number, because 20680939 - 2³ = 20680931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20680898 and 20680907.

It is not an unprimeable number, because it can be changed into a prime (20680931) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29584 + ... + 30274.

Almost surely, 2^20680939 is an apocalyptic number.

20680939 is a deficient number, since it is larger than the sum of its proper divisors (150337).

20680939 is an frugal number, since it uses more digits than its factorization.

20680939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037 (or 864 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 20680939 is about 4547.6300421208. The cubic root of 20680939 is about 274.4880347980.

The spelling of 20680939 in words is "twenty million, six hundred eighty thousand, nine hundred thirty-nine".