20431812 has 24 divisors (see below), whose sum is σ = 48347712. Its totient is φ = 6714400.

The previous prime is 20431811. The next prime is 20431813. The reversal of 20431812 is 21813402.

It is an interprime number because it is at equal distance from previous prime (20431811) and next prime (20431813).

It is not an unprimeable number, because it can be changed into a prime (20431811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11139 + ... + 12842.

It is an arithmetic number, because the mean of its divisors is an integer number (2014488).

Almost surely, 2^20431812 is an apocalyptic number.

It is an amenable number.

20431812 is an abundant number, since it is smaller than the sum of its proper divisors (27915900).

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

20431812 is a wasteful number, since it uses less digits than its factorization.

20431812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24059 (or 24057 counting only the distinct ones).

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

The square root of 20431812 is about 4520.1561919916. The cubic root of 20431812 is about 273.3813987784.

The spelling of 20431812 in words is "twenty million, four hundred thirty-one thousand, eight hundred twelve".