20108931 has 8 divisors (see below), whose sum is σ = 26854224. Its totient is φ = 13384800.

The previous prime is 20108917. The next prime is 20108939. The reversal of 20108931 is 13980102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20108931 - 2⁶ = 20108867 is a prime.

It is a super-2 number, since 2×20108931² = 808738211925522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20108939) 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, 2920 + ... + 6981.

It is an arithmetic number, because the mean of its divisors is an integer number (3356778).

Almost surely, 2^20108931 is an apocalyptic number.

20108931 is a deficient number, since it is larger than the sum of its proper divisors (6745293).

20108931 is an equidigital number, since it uses as much as digits as its factorization.

20108931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10581.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 20108931 is about 4484.2982728628. The cubic root of 20108931 is about 271.9336766999.

The spelling of 20108931 in words is "twenty million, one hundred eight thousand, nine hundred thirty-one".