20413431 has 8 divisors (see below), whose sum is σ = 30242160. Its totient is φ = 13608936.

The previous prime is 20413409. The next prime is 20413441. The reversal of 20413431 is 13431402.

It is not a de Polignac number, because 20413431 - 2⁵ = 20413399 is a prime.

It is a super-2 number, since 2×20413431² = 833416330383522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20413441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 378000 + ... + 378053.

It is an arithmetic number, because the mean of its divisors is an integer number (3780270).

Almost surely, 2^20413431 is an apocalyptic number.

20413431 is a deficient number, since it is larger than the sum of its proper divisors (9828729).

20413431 is an equidigital number, since it uses as much as digits as its factorization.

20413431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756062 (or 756056 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 20413431 is about 4518.1225082992. The cubic root of 20413431 is about 273.2993937964.

Adding to 20413431 its reverse (13431402), we get a palindrome (33844833).

The spelling of 20413431 in words is "twenty million, four hundred thirteen thousand, four hundred thirty-one".