20902131 has 12 divisors (see below), whose sum is σ = 31310552. Its totient is φ = 13934592.

The previous prime is 20902121. The next prime is 20902159. The reversal of 20902131 is 13120902.

It is a happy number.

It is not a de Polignac number, because 20902131 - 2¹⁰ = 20901107 is a prime.

It is a super-2 number, since 2×20902131² = 873798160682322, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (20902111) 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, 42766 + ... + 43251.

Almost surely, 2^20902131 is an apocalyptic number.

20902131 is a deficient number, since it is larger than the sum of its proper divisors (10408421).

20902131 is an frugal number, since it uses more digits than its factorization.

20902131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86032 (or 86020 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 20902131 is about 4571.8848410694. The cubic root of 20902131 is about 275.4631577990.

The spelling of 20902131 in words is "twenty million, nine hundred two thousand, one hundred thirty-one".