20104531 has 2 divisors, whose sum is σ = 20104532. Its totient is φ = 20104530.

The previous prime is 20104499. The next prime is 20104537. The reversal of 20104531 is 13540102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20104531 - 2⁵ = 20104499 is a prime.

It is a super-2 number, since 2×20104531² = 808384333459922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20104537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10052265 + 10052266.

It is an arithmetic number, because the mean of its divisors is an integer number (10052266).

Almost surely, 2^20104531 is an apocalyptic number.

20104531 is a deficient number, since it is larger than the sum of its proper divisors (1).

20104531 is an equidigital number, since it uses as much as digits as its factorization.

20104531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 20104531 is about 4483.8076452943. The cubic root of 20104531 is about 271.9138414758.

Adding to 20104531 its reverse (13540102), we get a palindrome (33644633).

The spelling of 20104531 in words is "twenty million, one hundred four thousand, five hundred thirty-one".