20568631 has 2 divisors, whose sum is σ = 20568632. Its totient is φ = 20568630.

The previous prime is 20568619. The next prime is 20568637. The reversal of 20568631 is 13686502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20568631 is a prime.

It is a super-2 number, since 2×20568631² = 846137162428322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20568593 and 20568602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20568637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10284315 + 10284316.

It is an arithmetic number, because the mean of its divisors is an integer number (10284316).

Almost surely, 2^20568631 is an apocalyptic number.

20568631 is a deficient number, since it is larger than the sum of its proper divisors (1).

20568631 is an equidigital number, since it uses as much as digits as its factorization.

20568631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 20568631 is about 4535.2652623634. The cubic root of 20568631 is about 273.9902628539.

The spelling of 20568631 in words is "twenty million, five hundred sixty-eight thousand, six hundred thirty-one".