20555684 has 12 divisors (see below), whose sum is σ = 36011724. Its totient is φ = 10266624.

The previous prime is 20555681. The next prime is 20555699. The reversal of 20555684 is 48655502.

It can be written as a sum of positive squares in 2 ways, for example, as 15366400 + 5189284 = 3920^2 + 2278^2 .

It is a super-2 number, since 2×20555684² = 845072289415712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20555681) by changing a digit.

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, 2384 + ... + 6840.

It is an arithmetic number, because the mean of its divisors is an integer number (3000977).

Almost surely, 2^20555684 is an apocalyptic number.

It is an amenable number.

20555684 is a deficient number, since it is larger than the sum of its proper divisors (15456040).

20555684 is a wasteful number, since it uses less digits than its factorization.

20555684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5614 (or 5612 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 35.

The square root of 20555684 is about 4533.8376680247. The cubic root of 20555684 is about 273.9327627301.

The spelling of 20555684 in words is "twenty million, five hundred fifty-five thousand, six hundred eighty-four".