20013749 has 8 divisors (see below), whose sum is σ = 23867520. Its totient is φ = 16408656.

The previous prime is 20013739. The next prime is 20013751. The reversal of 20013749 is 94731002.

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 20013749 - 2⁴ = 20013733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013739) 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, 61994 + ... + 62315.

It is an arithmetic number, because the mean of its divisors is an integer number (2983440).

Almost surely, 2^20013749 is an apocalyptic number.

It is an amenable number.

20013749 is a deficient number, since it is larger than the sum of its proper divisors (3853771).

20013749 is a wasteful number, since it uses less digits than its factorization.

20013749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124339.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 20013749 is about 4473.6728758370. The cubic root of 20013749 is about 271.5039482913.

The spelling of 20013749 in words is "twenty million, thirteen thousand, seven hundred forty-nine".