20431573 has 8 divisors (see below), whose sum is σ = 21818880. Its totient is φ = 19089840.

The previous prime is 20431549. The next prime is 20431577. The reversal of 20431573 is 37513402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20431573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431577) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10465 + ... + 12262.

It is an arithmetic number, because the mean of its divisors is an integer number (2727360).

Almost surely, 2^20431573 is an apocalyptic number.

It is an amenable number.

20431573 is a deficient number, since it is larger than the sum of its proper divisors (1387307).

20431573 is a wasteful number, since it uses less digits than its factorization.

20431573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22787.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 20431573 is about 4520.1297547747. The cubic root of 20431573 is about 273.3803328196.

Adding to 20431573 its reverse (37513402), we get a palindrome (57944975).

The spelling of 20431573 in words is "twenty million, four hundred thirty-one thousand, five hundred seventy-three".