20113749 has 12 divisors (see below), whose sum is σ = 29546400. Its totient is φ = 13181544.

The previous prime is 20113747. The next prime is 20113783. The reversal of 20113749 is 94731102.

It is not a de Polignac number, because 20113749 - 2¹ = 20113747 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20113747) 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 11 ways as a sum of consecutive naturals, for example, 18409 + ... + 19470.

It is an arithmetic number, because the mean of its divisors is an integer number (2462200).

Almost surely, 2^20113749 is an apocalyptic number.

It is an amenable number.

20113749 is a deficient number, since it is larger than the sum of its proper divisors (9432651).

20113749 is a wasteful number, since it uses less digits than its factorization.

20113749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37944 (or 37941 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 20113749 is about 4484.8354484864. The cubic root of 20113749 is about 271.9553929517.

The spelling of 20113749 in words is "twenty million, one hundred thirteen thousand, seven hundred forty-nine".