20320131 has 16 divisors (see below), whose sum is σ = 29675520. Its totient is φ = 12291360.

The previous prime is 20320103. The next prime is 20320171. The reversal of 20320131 is 13102302.

It is a happy number.

It is not a de Polignac number, because 20320131 - 2¹⁰ = 20319107 is a prime.

It is a super-2 number, since 2×20320131² = 825815447714322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20320171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2115 + ... + 6716.

It is an arithmetic number, because the mean of its divisors is an integer number (1854720).

Almost surely, 2^20320131 is an apocalyptic number.

20320131 is a deficient number, since it is larger than the sum of its proper divisors (9355389).

20320131 is a wasteful number, since it uses less digits than its factorization.

20320131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8906.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 20320131 is about 4507.7855982733. The cubic root of 20320131 is about 272.8823843606.

Adding to 20320131 its reverse (13102302), we get a palindrome (33422433).

The spelling of 20320131 in words is "twenty million, three hundred twenty thousand, one hundred thirty-one".