20155131 has 6 divisors (see below), whose sum is σ = 29112980. Its totient is φ = 13436748.

The previous prime is 20155129. The next prime is 20155147. The reversal of 20155131 is 13155102.

It is not a de Polignac number, because 20155131 - 2¹ = 20155129 is a prime.

It is a super-2 number, since 2×20155131² = 812458611254322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20155831) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1119721 + ... + 1119738.

Almost surely, 2^20155131 is an apocalyptic number.

20155131 is a deficient number, since it is larger than the sum of its proper divisors (8957849).

20155131 is a wasteful number, since it uses less digits than its factorization.

20155131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2239465 (or 2239462 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 20155131 is about 4489.4466251421. The cubic root of 20155131 is about 272.1417720773.

The spelling of 20155131 in words is "twenty million, one hundred fifty-five thousand, one hundred thirty-one".