20430431 has 8 divisors (see below), whose sum is σ = 23590560. Its totient is φ = 17330688.

The previous prime is 20430409. The next prime is 20430439. The reversal of 20430431 is 13403402.

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-20430431 is a prime.

It is a super-2 number, since 2×20430431² = 834805021691522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20430439) 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, 14366 + ... + 15723.

It is an arithmetic number, because the mean of its divisors is an integer number (2948820).

Almost surely, 2^20430431 is an apocalyptic number.

20430431 is a deficient number, since it is larger than the sum of its proper divisors (3160129).

20430431 is an equidigital number, since it uses as much as digits as its factorization.

20430431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30193.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 20430431 is about 4520.0034292022. The cubic root of 20430431 is about 273.3752392950.

Adding to 20430431 its reverse (13403402), we get a palindrome (33833833).

The spelling of 20430431 in words is "twenty million, four hundred thirty thousand, four hundred thirty-one".