20164531 has 2 divisors, whose sum is σ = 20164532. Its totient is φ = 20164530.

The previous prime is 20164523. The next prime is 20164559. The reversal of 20164531 is 13546102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20164531 - 2³ = 20164523 is a prime.

It is a super-2 number, since 2×20164531² = 813216620899922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20164561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10082265 + 10082266.

It is an arithmetic number, because the mean of its divisors is an integer number (10082266).

Almost surely, 2^20164531 is an apocalyptic number.

20164531 is a deficient number, since it is larger than the sum of its proper divisors (1).

20164531 is an equidigital number, since it uses as much as digits as its factorization.

20164531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20164531 is about 4490.4934027343. The cubic root of 20164531 is about 272.1840728868.

The spelling of 20164531 in words is "twenty million, one hundred sixty-four thousand, five hundred thirty-one".