20043749 has 8 divisors (see below), whose sum is σ = 21934848. Its totient is φ = 18164160.

The previous prime is 20043743. The next prime is 20043757. The reversal of 20043749 is 94734002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20043749 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 (20043743) 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, 1004 + ... + 6410.

It is an arithmetic number, because the mean of its divisors is an integer number (2741856).

Almost surely, 2^20043749 is an apocalyptic number.

It is an amenable number.

20043749 is a deficient number, since it is larger than the sum of its proper divisors (1891099).

20043749 is a wasteful number, since it uses less digits than its factorization.

20043749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5755.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 20043749 is about 4477.0245699571. The cubic root of 20043749 is about 271.6395392805.

The spelling of 20043749 in words is "twenty million, forty-three thousand, seven hundred forty-nine".