20007431 has 8 divisors (see below), whose sum is σ = 21004800. Its totient is φ = 19032120.

The previous prime is 20007409. The next prime is 20007457. The reversal of 20007431 is 13470002.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20007431 - 2¹⁴ = 19991047 is a prime.

It is a super-2 number, since 2×20007431² = 800594590439522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20004431) 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, 3641 + ... + 7298.

It is an arithmetic number, because the mean of its divisors is an integer number (2625600).

Almost surely, 2^20007431 is an apocalyptic number.

20007431 is a deficient number, since it is larger than the sum of its proper divisors (997369).

20007431 is a wasteful number, since it uses less digits than its factorization.

20007431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11029.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 20007431 is about 4472.9666888990. The cubic root of 20007431 is about 271.4753755589.

Adding to 20007431 its reverse (13470002), we get a palindrome (33477433).

The spelling of 20007431 in words is "twenty million, seven thousand, four hundred thirty-one".