20431107 has 24 divisors (see below), whose sum is σ = 31168800. Its totient is φ = 12870528.

The previous prime is 20431097. The next prime is 20431121. The reversal of 20431107 is 70113402.

It is not a de Polignac number, because 20431107 - 2⁴ = 20431091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20431107.

It is not an unprimeable number, because it can be changed into a prime (20431007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17869 + ... + 18977.

It is an arithmetic number, because the mean of its divisors is an integer number (1298700).

Almost surely, 2^20431107 is an apocalyptic number.

20431107 is a deficient number, since it is larger than the sum of its proper divisors (10737693).

20431107 is a wasteful number, since it uses less digits than its factorization.

20431107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1227 (or 1224 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 20431107 is about 4520.0782072880. The cubic root of 20431107 is about 273.3782543990.

Adding to 20431107 its reverse (70113402), we get a palindrome (90544509).

The spelling of 20431107 in words is "twenty million, four hundred thirty-one thousand, one hundred seven".