20004431 has 2 divisors, whose sum is σ = 20004432. Its totient is φ = 20004430.

The previous prime is 20004419. The next prime is 20004451. The reversal of 20004431 is 13440002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20004431 - 2⁶ = 20004367 is a prime.

It is a super-2 number, since 2×20004431² = 800354519267522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20004451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10002215 + 10002216.

It is an arithmetic number, because the mean of its divisors is an integer number (10002216).

Almost surely, 2^20004431 is an apocalyptic number.

20004431 is a deficient number, since it is larger than the sum of its proper divisors (1).

20004431 is an equidigital number, since it uses as much as digits as its factorization.

20004431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20004431 is about 4472.6313284240. The cubic root of 20004431 is about 271.4618061534.

Adding to 20004431 its reverse (13440002), we get a palindrome (33444433).

The spelling of 20004431 in words is "twenty million, four thousand, four hundred thirty-one".