20604131 has 2 divisors, whose sum is σ = 20604132. Its totient is φ = 20604130.

The previous prime is 20604107. The next prime is 20604137. The reversal of 20604131 is 13140602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20604131 - 2¹⁸ = 20341987 is a prime.

It is a super-2 number, since 2×20604131² = 849060428530322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20604137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10302065 + 10302066.

It is an arithmetic number, because the mean of its divisors is an integer number (10302066).

Almost surely, 2^20604131 is an apocalyptic number.

20604131 is a deficient number, since it is larger than the sum of its proper divisors (1).

20604131 is an equidigital number, since it uses as much as digits as its factorization.

20604131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 20604131 is about 4539.1773483749. The cubic root of 20604131 is about 274.1478015164.

Adding to 20604131 its reverse (13140602), we get a palindrome (33744733).

The spelling of 20604131 in words is "twenty million, six hundred four thousand, one hundred thirty-one".