20432331 has 20 divisors (see below), whose sum is σ = 30703992. Its totient is φ = 13540608.

The previous prime is 20432329. The next prime is 20432333. The reversal of 20432331 is 13323402.

It is an interprime number because it is at equal distance from previous prime (20432329) and next prime (20432333).

It is not a de Polignac number, because 20432331 - 2¹ = 20432329 is a prime.

It is a super-2 number, since 2×20432331² = 834960300187122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20432333) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14980 + ... + 16286.

Almost surely, 2^20432331 is an apocalyptic number.

20432331 is a deficient number, since it is larger than the sum of its proper divisors (10271661).

20432331 is a wasteful number, since it uses less digits than its factorization.

20432331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1512 (or 1503 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 20432331 is about 4520.2136011476. The cubic root of 20432331 is about 273.3837135306.

Adding to 20432331 its reverse (13323402), we get a palindrome (33755733).

The spelling of 20432331 in words is "twenty million, four hundred thirty-two thousand, three hundred thirty-one".