20568131 has 2 divisors, whose sum is σ = 20568132. Its totient is φ = 20568130.

The previous prime is 20568103. The next prime is 20568137. The reversal of 20568131 is 13186502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20568131 is a prime.

It is a super-2 number, since 2×20568131² = 846096025666322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20568131.

It is not a weakly prime, because it can be changed into another prime (20568137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10284065 + 10284066.

It is an arithmetic number, because the mean of its divisors is an integer number (10284066).

Almost surely, 2^20568131 is an apocalyptic number.

20568131 is a deficient number, since it is larger than the sum of its proper divisors (1).

20568131 is an equidigital number, since it uses as much as digits as its factorization.

20568131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 20568131 is about 4535.2101384611. The cubic root of 20568131 is about 273.9880427055.

The spelling of 20568131 in words is "twenty million, five hundred sixty-eight thousand, one hundred thirty-one".