20680911 has 12 divisors (see below), whose sum is σ = 31444920. Its totient is φ = 13061520.

The previous prime is 20680903. The next prime is 20680927. The reversal of 20680911 is 11908602.

It is not a de Polignac number, because 20680911 - 2³ = 20680903 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20680901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60300 + ... + 60641.

It is an arithmetic number, because the mean of its divisors is an integer number (2620410).

Almost surely, 2^20680911 is an apocalyptic number.

20680911 is a deficient number, since it is larger than the sum of its proper divisors (10764009).

20680911 is a wasteful number, since it uses less digits than its factorization.

20680911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120966 (or 120963 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 20680911 is about 4547.6269635932. The cubic root of 20680911 is about 274.4879109211.

The spelling of 20680911 in words is "twenty million, six hundred eighty thousand, nine hundred eleven".