20045644 has 12 divisors (see below), whose sum is σ = 35124768. Its totient is φ = 10010000.

The previous prime is 20045629. The next prime is 20045651. The reversal of 20045644 is 44654002.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 894 + ... + 6394.

It is an arithmetic number, because the mean of its divisors is an integer number (2927064).

Almost surely, 2^20045644 is an apocalyptic number.

It is an amenable number.

20045644 is a deficient number, since it is larger than the sum of its proper divisors (15079124).

20045644 is a wasteful number, since it uses less digits than its factorization.

20045644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6416 (or 6414 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 20045644 is about 4477.2362010508. The cubic root of 20045644 is about 271.6480995670.

Adding to 20045644 its reverse (44654002), we get a palindrome (64699646).

The spelling of 20045644 in words is "twenty million, forty-five thousand, six hundred forty-four".