20268931 has 2 divisors, whose sum is σ = 20268932. Its totient is φ = 20268930.

The previous prime is 20268901. The next prime is 20268959. The reversal of 20268931 is 13986202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20268931 - 2¹⁵ = 20236163 is a prime.

It is a super-2 number, since 2×20268931² = 821659127765522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20268893 and 20268902.

It is not a weakly prime, because it can be changed into another prime (20268901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10134465 + 10134466.

It is an arithmetic number, because the mean of its divisors is an integer number (10134466).

Almost surely, 2^20268931 is an apocalyptic number.

20268931 is a deficient number, since it is larger than the sum of its proper divisors (1).

20268931 is an equidigital number, since it uses as much as digits as its factorization.

20268931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 20268931 is about 4502.1029530654. The cubic root of 20268931 is about 272.6530005193.

The spelling of 20268931 in words is "twenty million, two hundred sixty-eight thousand, nine hundred thirty-one".