20311879 has 12 divisors (see below), whose sum is σ = 23682736. Its totient is φ = 17065152.

The previous prime is 20311877. The next prime is 20311883. The reversal of 20311879 is 97811302.

It is not a de Polignac number, because 20311879 - 2¹ = 20311877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20311879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311877) 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, 19147 + ... + 20179.

Almost surely, 2^20311879 is an apocalyptic number.

20311879 is a deficient number, since it is larger than the sum of its proper divisors (3370857).

20311879 is an equidigital number, since it uses as much as digits as its factorization.

20311879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146 (or 1093 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 20311879 is about 4506.8702000390. The cubic root of 20311879 is about 272.8454402037.

The spelling of 20311879 in words is "twenty million, three hundred eleven thousand, eight hundred seventy-nine".