20308131 has 32 divisors (see below), whose sum is σ = 32716800. Its totient is φ = 12402720.

The previous prime is 20308129. The next prime is 20308157. The reversal of 20308131 is 13180302.

It is not a de Polignac number, because 20308131 - 2¹ = 20308129 is a prime.

It is a super-2 number, since 2×20308131² = 824840369426322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20308111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15265 + ... + 16541.

It is an arithmetic number, because the mean of its divisors is an integer number (1022400).

Almost surely, 2^20308131 is an apocalyptic number.

20308131 is a deficient number, since it is larger than the sum of its proper divisors (12408669).

20308131 is a wasteful number, since it uses less digits than its factorization.

20308131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336 (or 1330 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 20308131 is about 4506.4543712324. The cubic root of 20308131 is about 272.8286571246.

Adding to 20308131 its reverse (13180302), we get a palindrome (33488433).

The spelling of 20308131 in words is "twenty million, three hundred eight thousand, one hundred thirty-one".