20455131 has 12 divisors (see below), whose sum is σ = 28973432. Its totient is φ = 12834048.

The previous prime is 20455129. The next prime is 20455139. The reversal of 20455131 is 13155402.

It is not a de Polignac number, because 20455131 - 2¹ = 20455129 is a prime.

It is a super-2 number, since 2×20455131² = 836824768454322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20455098 and 20455107.

It is not an unprimeable number, because it can be changed into a prime (20455139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10930 + ... + 12663.

Almost surely, 2^20455131 is an apocalyptic number.

20455131 is a deficient number, since it is larger than the sum of its proper divisors (8518301).

20455131 is a wasteful number, since it uses less digits than its factorization.

20455131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23630 (or 23613 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 20455131 is about 4522.7349026889. The cubic root of 20455131 is about 273.4853634047.

The spelling of 20455131 in words is "twenty million, four hundred fifty-five thousand, one hundred thirty-one".