20492931 has 24 divisors (see below), whose sum is σ = 29419600. Its totient is φ = 12678336.

The previous prime is 20492929. The next prime is 20492947. The reversal of 20492931 is 13929402.

It is not a de Polignac number, because 20492931 - 2¹ = 20492929 is a prime.

It is a super-2 number, since 2×20492931² = 839920441941522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20492911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58545 + ... + 58893.

Almost surely, 2^20492931 is an apocalyptic number.

20492931 is a deficient number, since it is larger than the sum of its proper divisors (8926669).

20492931 is a wasteful number, since it uses less digits than its factorization.

20492931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435 (or 412 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 20492931 is about 4526.9118613024. The cubic root of 20492931 is about 273.6537219028.

The spelling of 20492931 in words is "twenty million, four hundred ninety-two thousand, nine hundred thirty-one".