20655872 has 18 divisors (see below), whose sum is σ = 41231568. Its totient is φ = 10327808.

The previous prime is 20655871. The next prime is 20655919. The reversal of 20655872 is 27855602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20655871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40088 + ... + 40599.

Almost surely, 2^20655872 is an apocalyptic number.

It is an amenable number.

20655872 is a deficient number, since it is larger than the sum of its proper divisors (20575696).

20655872 is an frugal number, since it uses more digits than its factorization.

20655872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80703 (or 80689 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 35.

The square root of 20655872 is about 4544.8731555457. The cubic root of 20655872 is about 274.3770892651.

The spelling of 20655872 in words is "twenty million, six hundred fifty-five thousand, eight hundred seventy-two".