20686707 has 12 divisors (see below), whose sum is σ = 29955744. Its totient is φ = 13756560.

The previous prime is 20686693. The next prime is 20686709. The reversal of 20686707 is 70768602.

It is not a de Polignac number, because 20686707 - 2⁴ = 20686691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20686709) 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, 1213 + ... + 6545.

It is an arithmetic number, because the mean of its divisors is an integer number (2496312).

Almost surely, 2^20686707 is an apocalyptic number.

20686707 is a deficient number, since it is larger than the sum of its proper divisors (9269037).

20686707 is a wasteful number, since it uses less digits than its factorization.

20686707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5770 (or 5767 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 20686707 is about 4548.2641743857. The cubic root of 20686707 is about 274.5135510445.

The spelling of 20686707 in words is "twenty million, six hundred eighty-six thousand, seven hundred seven".