20465131 has 2 divisors, whose sum is σ = 20465132. Its totient is φ = 20465130.

The previous prime is 20465117. The next prime is 20465143. The reversal of 20465131 is 13156402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20465131 - 2⁵ = 20465099 is a prime.

It is a super-2 number, since 2×20465131² = 837643173694322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20465531) 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, 10232565 + 10232566.

It is an arithmetic number, because the mean of its divisors is an integer number (10232566).

Almost surely, 2^20465131 is an apocalyptic number.

20465131 is a deficient number, since it is larger than the sum of its proper divisors (1).

20465131 is an equidigital number, since it uses as much as digits as its factorization.

20465131 is an odious number, because the sum of its binary digits is odd.

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

The square root of 20465131 is about 4523.8402933791. The cubic root of 20465131 is about 273.5299228536.

The spelling of 20465131 in words is "twenty million, four hundred sixty-five thousand, one hundred thirty-one".