20164631 has 2 divisors, whose sum is σ = 20164632. Its totient is φ = 20164630.

The previous prime is 20164621. The next prime is 20164649. The reversal of 20164631 is 13646102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20164631 is a prime.

It is a super-2 number, since 2×20164631² = 813224686732322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20164597 and 20164606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20164621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10082315 + 10082316.

It is an arithmetic number, because the mean of its divisors is an integer number (10082316).

Almost surely, 2^20164631 is an apocalyptic number.

20164631 is a deficient number, since it is larger than the sum of its proper divisors (1).

20164631 is an equidigital number, since it uses as much as digits as its factorization.

20164631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20164631 is about 4490.5045373543. The cubic root of 20164631 is about 272.1845228248.

The spelling of 20164631 in words is "twenty million, one hundred sixty-four thousand, six hundred thirty-one".