20044661 has 32 divisors (see below), whose sum is σ = 26331648. Its totient is φ = 14826240.

The previous prime is 20044657. The next prime is 20044667. The reversal of 20044661 is 16644002.

It is a happy number.

It is not a de Polignac number, because 20044661 - 2² = 20044657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20044667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 127595 + ... + 127751.

It is an arithmetic number, because the mean of its divisors is an integer number (822864).

Almost surely, 2^20044661 is an apocalyptic number.

It is an amenable number.

20044661 is a deficient number, since it is larger than the sum of its proper divisors (6286987).

20044661 is a wasteful number, since it uses less digits than its factorization.

20044661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 20044661 is about 4477.1264221596. The cubic root of 20044661 is about 271.6436591269.

Adding to 20044661 its reverse (16644002), we get a palindrome (36688663).

The spelling of 20044661 in words is "twenty million, forty-four thousand, six hundred sixty-one".