20392491 has 16 divisors (see below), whose sum is σ = 32710400. Its totient is φ = 11039328.

The previous prime is 20392459. The next prime is 20392499. The reversal of 20392491 is 19429302.

It is not a de Polignac number, because 20392491 - 2⁵ = 20392459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20392499) 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, 25156 + ... + 25953.

It is an arithmetic number, because the mean of its divisors is an integer number (2044400).

Almost surely, 2^20392491 is an apocalyptic number.

20392491 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20392491 is a deficient number, since it is larger than the sum of its proper divisors (12317909).

20392491 is a wasteful number, since it uses less digits than its factorization.

20392491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51138.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 20392491 is about 4515.8045794742. The cubic root of 20392491 is about 273.2059120872.

The spelling of 20392491 in words is "twenty million, three hundred ninety-two thousand, four hundred ninety-one".