20431593 has 72 divisors (see below), whose sum is σ = 38825280. Its totient is φ = 10108800.

The previous prime is 20431591. The next prime is 20431627. The reversal of 20431593 is 39513402.

It is not a de Polignac number, because 20431593 - 2¹ = 20431591 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20431591) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 202243 + ... + 202343.

It is an arithmetic number, because the mean of its divisors is an integer number (539240).

Almost surely, 2^20431593 is an apocalyptic number.

It is an amenable number.

20431593 is a deficient number, since it is larger than the sum of its proper divisors (18393687).

20431593 is a wasteful number, since it uses less digits than its factorization.

20431593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 20431593 is about 4520.1319671001. The cubic root of 20431593 is about 273.3804220215.

Adding to 20431593 its reverse (39513402), we get a palindrome (59944995).

The spelling of 20431593 in words is "twenty million, four hundred thirty-one thousand, five hundred ninety-three".