20696931 has 8 divisors (see below), whose sum is σ = 30662160. Its totient is φ = 13797936.

The previous prime is 20696911. The next prime is 20696953. The reversal of 20696931 is 13969602.

It is not a de Polignac number, because 20696931 - 2⁶ = 20696867 is a prime.

It is a super-2 number, since 2×20696931² = 856725905637522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20696911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 383250 + ... + 383303.

It is an arithmetic number, because the mean of its divisors is an integer number (3832770).

Almost surely, 2^20696931 is an apocalyptic number.

20696931 is a deficient number, since it is larger than the sum of its proper divisors (9965229).

20696931 is an equidigital number, since it uses as much as digits as its factorization.

20696931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766562 (or 766556 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 20696931 is about 4549.3879808168. The cubic root of 20696931 is about 274.5587679125.

The spelling of 20696931 in words is "twenty million, six hundred ninety-six thousand, nine hundred thirty-one".