20112491 has 16 divisors (see below), whose sum is σ = 23654400. Its totient is φ = 17093160.

The previous prime is 20112473. The next prime is 20112503. The reversal of 20112491 is 19421102.

It is a de Polignac number, because none of the positive numbers 2^k-20112491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20112401) 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 15 ways as a sum of consecutive naturals, for example, 65360 + ... + 65666.

It is an arithmetic number, because the mean of its divisors is an integer number (1478400).

Almost surely, 2^20112491 is an apocalyptic number.

20112491 is a deficient number, since it is larger than the sum of its proper divisors (3541909).

20112491 is an equidigital number, since it uses as much as digits as its factorization.

20112491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519 (or 505 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 20112491 is about 4484.6951958857. The cubic root of 20112491 is about 271.9497230819.

Adding to 20112491 its reverse (19421102), we get a palindrome (39533593).

The spelling of 20112491 in words is "twenty million, one hundred twelve thousand, four hundred ninety-one".