20423644 has 24 divisors (see below), whose sum is σ = 36465408. Its totient is φ = 10007280.

The previous prime is 20423639. The next prime is 20423653. The reversal of 20423644 is 44632402.

It is a congruent number.

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, 75229 + ... + 75499.

It is an arithmetic number, because the mean of its divisors is an integer number (1519392).

Almost surely, 2^20423644 is an apocalyptic number.

It is an amenable number.

20423644 is a deficient number, since it is larger than the sum of its proper divisors (16041764).

20423644 is a wasteful number, since it uses less digits than its factorization.

20423644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585 (or 583 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 20423644 is about 4519.2525930733. The cubic root of 20423644 is about 273.3449641425.

The spelling of 20423644 in words is "twenty million, four hundred twenty-three thousand, six hundred forty-four".