20931123 has 4 divisors (see below), whose sum is σ = 27908168. Its totient is φ = 13954080.

The previous prime is 20931101. The next prime is 20931133. The reversal of 20931123 is 32113902.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20931123 - 2¹⁰ = 20930099 is a prime.

It is a super-2 number, since 2×20931123² = 876223820082258, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20931123.

It is not an unprimeable number, because it can be changed into a prime (20931133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3488518 + ... + 3488523.

It is an arithmetic number, because the mean of its divisors is an integer number (6977042).

Almost surely, 2^20931123 is an apocalyptic number.

20931123 is a deficient number, since it is larger than the sum of its proper divisors (6977045).

20931123 is an equidigital number, since it uses as much as digits as its factorization.

20931123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6977044.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 20931123 is about 4575.0544259058. The cubic root of 20931123 is about 275.5904580301.

The spelling of 20931123 in words is "twenty million, nine hundred thirty-one thousand, one hundred twenty-three".