20104645 has 24 divisors (see below), whose sum is σ = 27552672. Its totient is φ = 13965600.

The previous prime is 20104639. The next prime is 20104657. The reversal of 20104645 is 54640102.

It is not a de Polignac number, because 20104645 - 2¹⁷ = 19973573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28750 + ... + 29440.

It is an arithmetic number, because the mean of its divisors is an integer number (1148028).

Almost surely, 2^20104645 is an apocalyptic number.

It is an amenable number.

20104645 is a deficient number, since it is larger than the sum of its proper divisors (7448027).

20104645 is a wasteful number, since it uses less digits than its factorization.

20104645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753 (or 730 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 20104645 is about 4483.8203576861. The cubic root of 20104645 is about 271.9143554249.

Adding to 20104645 its reverse (54640102), we get a palindrome (74744747).

The spelling of 20104645 in words is "twenty million, one hundred four thousand, six hundred forty-five".