20112431 has 4 divisors (see below), whose sum is σ = 21171000. Its totient is φ = 19053864.

The previous prime is 20112413. The next prime is 20112439. The reversal of 20112431 is 13421102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20112431 - 2¹⁸ = 19850287 is a prime.

It is a super-2 number, since 2×20112431² = 809019761459522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 529256 + ... + 529293.

It is an arithmetic number, because the mean of its divisors is an integer number (5292750).

Almost surely, 2^20112431 is an apocalyptic number.

20112431 is a deficient number, since it is larger than the sum of its proper divisors (1058569).

20112431 is a wasteful number, since it uses less digits than its factorization.

20112431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058568.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 20112431 is about 4484.6885064629. The cubic root of 20112431 is about 271.9494526529.

Adding to 20112431 its reverse (13421102), we get a palindrome (33533533).

The spelling of 20112431 in words is "twenty million, one hundred twelve thousand, four hundred thirty-one".