20364931 has 4 divisors (see below), whose sum is σ = 21067200. Its totient is φ = 19662664.

The previous prime is 20364907. The next prime is 20364943. The reversal of 20364931 is 13946302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20364931 - 2⁷ = 20364803 is a prime.

It is a super-2 number, since 2×20364931² = 829460829269522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20364931.

It is not an unprimeable number, because it can be changed into a prime (20364901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 351091 + ... + 351148.

It is an arithmetic number, because the mean of its divisors is an integer number (5266800).

Almost surely, 2^20364931 is an apocalyptic number.

20364931 is a deficient number, since it is larger than the sum of its proper divisors (702269).

20364931 is an equidigital number, since it uses as much as digits as its factorization.

20364931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702268.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 20364931 is about 4512.7520428226. The cubic root of 20364931 is about 273.0827793534.

The spelling of 20364931 in words is "twenty million, three hundred sixty-four thousand, nine hundred thirty-one".