20445508 has 6 divisors (see below), whose sum is σ = 35779646. Its totient is φ = 10222752.

The previous prime is 20445499. The next prime is 20445521. The reversal of 20445508 is 80554402.

It can be written as a sum of positive squares in only one way, i.e., 12616704 + 7828804 = 3552^2 + 2798^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2555685 + ... + 2555692.

Almost surely, 2^20445508 is an apocalyptic number.

It is an amenable number.

20445508 is a deficient number, since it is larger than the sum of its proper divisors (15334138).

20445508 is a wasteful number, since it uses less digits than its factorization.

20445508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5111381 (or 5111379 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

The square root of 20445508 is about 4521.6709300877. The cubic root of 20445508 is about 273.4424701333.

The spelling of 20445508 in words is "twenty million, four hundred forty-five thousand, five hundred eight".