20445764 has 12 divisors (see below), whose sum is σ = 37884924. Its totient is φ = 9621504.

The previous prime is 20445751. The next prime is 20445773. The reversal of 20445764 is 46754402.

It can be written as a sum of positive squares in 2 ways, for example, as 11505664 + 8940100 = 3392^2 + 2990^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20445764.

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, 150269 + ... + 150404.

It is an arithmetic number, because the mean of its divisors is an integer number (3157077).

Almost surely, 2^20445764 is an apocalyptic number.

It is an amenable number.

20445764 is a deficient number, since it is larger than the sum of its proper divisors (17439160).

20445764 is a wasteful number, since it uses less digits than its factorization.

20445764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300694 (or 300692 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 32.

The square root of 20445764 is about 4521.6992381183. The cubic root of 20445764 is about 273.4436113943.

The spelling of 20445764 in words is "twenty million, four hundred forty-five thousand, seven hundred sixty-four".