20912431 has 8 divisors (see below), whose sum is σ = 22410864. Its totient is φ = 19443840.

The previous prime is 20912417. The next prime is 20912453. The reversal of 20912431 is 13421902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20912431 - 2⁷ = 20912303 is a prime.

It is a super-2 number, since 2×20912431² = 874659540659522, 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 (20912461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6000 + ... + 8821.

It is an arithmetic number, because the mean of its divisors is an integer number (2801358).

Almost surely, 2^20912431 is an apocalyptic number.

20912431 is a deficient number, since it is larger than the sum of its proper divisors (1498433).

20912431 is a wasteful number, since it uses less digits than its factorization.

20912431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14921.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 20912431 is about 4573.0111524028. The cubic root of 20912431 is about 275.5083972790.

The spelling of 20912431 in words is "twenty million, nine hundred twelve thousand, four hundred thirty-one".