20113739 has 4 divisors (see below), whose sum is σ = 20604360. Its totient is φ = 19623120.

The previous prime is 20113721. The next prime is 20113747. The reversal of 20113739 is 93731102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93731102 = 2 ⋅46865551.

It is a cyclic number.

It is not a de Polignac number, because 20113739 - 2²⁴ = 3336523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20113139) 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, 245249 + ... + 245330.

It is an arithmetic number, because the mean of its divisors is an integer number (5151090).

Almost surely, 2^20113739 is an apocalyptic number.

20113739 is a deficient number, since it is larger than the sum of its proper divisors (490621).

20113739 is an equidigital number, since it uses as much as digits as its factorization.

20113739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490620.

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 20113739 is about 4484.8343336181. The cubic root of 20113739 is about 271.9553478821.

The spelling of 20113739 in words is "twenty million, one hundred thirteen thousand, seven hundred thirty-nine".