20431244 has 12 divisors (see below), whose sum is σ = 36258768. Its totient is φ = 10071600.

The previous prime is 20431237. The next prime is 20431247. The reversal of 20431244 is 44213402.

It is not an unprimeable number, because it can be changed into a prime (20431247) 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, 35687 + ... + 36254.

It is an arithmetic number, because the mean of its divisors is an integer number (3021564).

Almost surely, 2^20431244 is an apocalyptic number.

It is an amenable number.

20431244 is a deficient number, since it is larger than the sum of its proper divisors (15827524).

20431244 is a wasteful number, since it uses less digits than its factorization.

20431244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72016 (or 72014 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 20431244 is about 4520.0933618677. The cubic root of 20431244 is about 273.3788654401.

Adding to 20431244 its reverse (44213402), we get a palindrome (64644646).

The spelling of 20431244 in words is "twenty million, four hundred thirty-one thousand, two hundred forty-four".