20431324 has 6 divisors (see below), whose sum is σ = 35754824. Its totient is φ = 10215660.

The previous prime is 20431319. The next prime is 20431343. The reversal of 20431324 is 42313402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2553912 + ... + 2553919.

Almost surely, 2^20431324 is an apocalyptic number.

It is an amenable number.

20431324 is a deficient number, since it is larger than the sum of its proper divisors (15323500).

20431324 is a wasteful number, since it uses less digits than its factorization.

20431324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5107835 (or 5107833 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 20431324 is about 4520.1022112337. The cubic root of 20431324 is about 273.3792222512.

Adding to 20431324 its reverse (42313402), we get a palindrome (62744726).

The spelling of 20431324 in words is "twenty million, four hundred thirty-one thousand, three hundred twenty-four".