20107431 has 6 divisors (see below), whose sum is σ = 29044080. Its totient is φ = 13404948.

The previous prime is 20107429. The next prime is 20107441. The reversal of 20107431 is 13470102.

It is not a de Polignac number, because 20107431 - 2¹ = 20107429 is a prime.

It is a super-2 number, since 2×20107431² = 808617562839522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20107441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1117071 + ... + 1117088.

It is an arithmetic number, because the mean of its divisors is an integer number (4840680).

Almost surely, 2^20107431 is an apocalyptic number.

20107431 is a deficient number, since it is larger than the sum of its proper divisors (8936649).

20107431 is a wasteful number, since it uses less digits than its factorization.

20107431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2234165 (or 2234162 counting only the distinct ones).

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

The square root of 20107431 is about 4484.1310194953. The cubic root of 20107431 is about 271.9269150167.

Adding to 20107431 its reverse (13470102), we get a palindrome (33577533).

The spelling of 20107431 in words is "twenty million, one hundred seven thousand, four hundred thirty-one".