20480431 has 2 divisors, whose sum is σ = 20480432. Its totient is φ = 20480430.

The previous prime is 20480389. The next prime is 20480479. The reversal of 20480431 is 13408402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20480431 - 2⁹ = 20479919 is a prime.

It is a super-2 number, since 2×20480431² = 838896107891522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20480531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10240215 + 10240216.

It is an arithmetic number, because the mean of its divisors is an integer number (10240216).

Almost surely, 2^20480431 is an apocalyptic number.

20480431 is a deficient number, since it is larger than the sum of its proper divisors (1).

20480431 is an equidigital number, since it uses as much as digits as its factorization.

20480431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 20480431 is about 4525.5310185657. The cubic root of 20480431 is about 273.5980707247.

Adding to 20480431 its reverse (13408402), we get a palindrome (33888833).

The spelling of 20480431 in words is "twenty million, four hundred eighty thousand, four hundred thirty-one".