20445388 has 24 divisors (see below), whose sum is σ = 37290960. Its totient is φ = 9799680.

The previous prime is 20445361. The next prime is 20445427. The reversal of 20445388 is 88354402.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8620 + ... + 10732.

It is an arithmetic number, because the mean of its divisors is an integer number (1553790).

Almost surely, 2^20445388 is an apocalyptic number.

It is an amenable number.

20445388 is a deficient number, since it is larger than the sum of its proper divisors (16845572).

20445388 is a wasteful number, since it uses less digits than its factorization.

20445388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2217 (or 2215 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 34.

The square root of 20445388 is about 4521.6576606373. The cubic root of 20445388 is about 273.4419351640.

The spelling of 20445388 in words is "twenty million, four hundred forty-five thousand, three hundred eighty-eight".