20355872 has 24 divisors (see below), whose sum is σ = 40318236. Its totient is φ = 10116352.

The previous prime is 20355847. The next prime is 20355877. The reversal of 20355872 is 27855302.

It can be written as a sum of positive squares in 2 ways, for example, as 17272336 + 3083536 = 4156^2 + 1756^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (20355877) 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 in 3 ways as a sum of consecutive naturals, for example, 3698 + ... + 7374.

Almost surely, 2^20355872 is an apocalyptic number.

It is an amenable number.

20355872 is a deficient number, since it is larger than the sum of its proper divisors (19962364).

20355872 is a wasteful number, since it uses less digits than its factorization.

20355872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3860 (or 3852 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 20355872 is about 4511.7482199254. The cubic root of 20355872 is about 273.0422812408.

The spelling of 20355872 in words is "twenty million, three hundred fifty-five thousand, eight hundred seventy-two".