20149131 has 16 divisors (see below), whose sum is σ = 28746144. Its totient is φ = 12509184.

The previous prime is 20149123. The next prime is 20149133. The reversal of 20149131 is 13194102.

It is not a de Polignac number, because 20149131 - 2³ = 20149123 is a prime.

It is a super-2 number, since 2×20149131² = 811974960110322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20149098 and 20149107.

It is not an unprimeable number, because it can be changed into a prime (20149133) 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, 2911 + ... + 6983.

It is an arithmetic number, because the mean of its divisors is an integer number (1796634).

Almost surely, 2^20149131 is an apocalyptic number.

20149131 is a deficient number, since it is larger than the sum of its proper divisors (8597013).

20149131 is a wasteful number, since it uses less digits than its factorization.

20149131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4190.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 20149131 is about 4488.7783415981. The cubic root of 20149131 is about 272.1147646834.

The spelling of 20149131 in words is "twenty million, one hundred forty-nine thousand, one hundred thirty-one".