20444805 has 56 divisors (see below), whose sum is σ = 37774080. Its totient is φ = 10614240.

The previous prime is 20444791. The next prime is 20444819. The reversal of 20444805 is 50844402.

20444805 = 40² + 41² + ... + 394².

It is an interprime number because it is at equal distance from previous prime (20444791) and next prime (20444819).

It is not a de Polignac number, because 20444805 - 2⁹ = 20444293 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 258756 + ... + 258834.

Almost surely, 2^20444805 is an apocalyptic number.

It is an amenable number.

20444805 is a deficient number, since it is larger than the sum of its proper divisors (17329275).

20444805 is an frugal number, since it uses more digits than its factorization.

20444805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

The square root of 20444805 is about 4521.5931926700. The cubic root of 20444805 is about 273.4393360747.

The spelling of 20444805 in words is "twenty million, four hundred forty-four thousand, eight hundred five".