20344431 has 8 divisors (see below), whose sum is σ = 27333504. Its totient is φ = 13459160.

The previous prime is 20344417. The next prime is 20344433. The reversal of 20344431 is 13444302.

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-20344431 is a prime.

It is a super-2 number, since 2×20344431² = 827791745427522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20344398 and 20344407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20344433) 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, 25491 + ... + 26276.

It is an arithmetic number, because the mean of its divisors is an integer number (3416688).

Almost surely, 2^20344431 is an apocalyptic number.

20344431 is a deficient number, since it is larger than the sum of its proper divisors (6989073).

20344431 is a wasteful number, since it uses less digits than its factorization.

20344431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51901.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 20344431 is about 4510.4801296536. The cubic root of 20344431 is about 272.9911172625.

Adding to 20344431 its reverse (13444302), we get a palindrome (33788733).

The spelling of 20344431 in words is "twenty million, three hundred forty-four thousand, four hundred thirty-one".