20456644 has 48 divisors (see below), whose sum is σ = 41510448. Its totient is φ = 8736768.

The previous prime is 20456617. The next prime is 20456651. The reversal of 20456644 is 44665402.

It can be written as a sum of positive squares in 8 ways, for example, as 1638400 + 18818244 = 1280^2 + 4338^2 .

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, 64374 + ... + 64690.

It is an arithmetic number, because the mean of its divisors is an integer number (864801).

Almost surely, 2^20456644 is an apocalyptic number.

It is an amenable number.

20456644 is an abundant number, since it is smaller than the sum of its proper divisors (21053804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20456644 is a wasteful number, since it uses less digits than its factorization.

20456644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424 (or 422 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 20456644 is about 4522.9021656454. The cubic root of 20456644 is about 273.4921061816.

The spelling of 20456644 in words is "twenty million, four hundred fifty-six thousand, six hundred forty-four".