20311842 has 16 divisors (see below), whose sum is σ = 40803840. Its totient is φ = 6740592.

The previous prime is 20311831. The next prime is 20311859. The reversal of 20311842 is 24811302.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6018 + ... + 8765.

It is an arithmetic number, because the mean of its divisors is an integer number (2550240).

Almost surely, 2^20311842 is an apocalyptic number.

20311842 is an abundant number, since it is smaller than the sum of its proper divisors (20491998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20311842 is a wasteful number, since it uses less digits than its factorization.

20311842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15017.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 20311842 is about 4506.8660951930. The cubic root of 20311842 is about 272.8452745324.

The spelling of 20311842 in words is "twenty million, three hundred eleven thousand, eight hundred forty-two".