20464805 has 16 divisors (see below), whose sum is σ = 26688000. Its totient is φ = 15007680.

The previous prime is 20464789. The next prime is 20464817. The reversal of 20464805 is 50846402.

It is not a de Polignac number, because 20464805 - 2⁴ = 20464789 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 530 + ... + 6419.

It is an arithmetic number, because the mean of its divisors is an integer number (1668000).

Almost surely, 2^20464805 is an apocalyptic number.

It is an amenable number.

20464805 is a deficient number, since it is larger than the sum of its proper divisors (6223195).

20464805 is a wasteful number, since it uses less digits than its factorization.

20464805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7004.

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 20464805 is about 4523.8042619017. The cubic root of 20464805 is about 273.5284704444.

The spelling of 20464805 in words is "twenty million, four hundred sixty-four thousand, eight hundred five".