20375644 has 12 divisors (see below), whose sum is σ = 35689024. Its totient is φ = 10178784.

The previous prime is 20375633. The next prime is 20375699. The reversal of 20375644 is 44657302.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7384 + ... + 9760.

Almost surely, 2^20375644 is an apocalyptic number.

It is an amenable number.

20375644 is a deficient number, since it is larger than the sum of its proper divisors (15313380).

20375644 is a wasteful number, since it uses less digits than its factorization.

20375644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4524 (or 4522 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 31.

The square root of 20375644 is about 4513.9388564756. The cubic root of 20375644 is about 273.1306561499.

The spelling of 20375644 in words is "twenty million, three hundred seventy-five thousand, six hundred forty-four".