20660544 has 42 divisors (see below), whose sum is σ = 59221370. Its totient is φ = 6886656.

The previous prime is 20660527. The next prime is 20660567. The reversal of 20660544 is 44506602.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20142144 + 518400 = 4488^2 + 720^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17359 + ... + 18510.

Almost surely, 2^20660544 is an apocalyptic number.

20660544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20660544 is an abundant number, since it is smaller than the sum of its proper divisors (38560826).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20660544 is a wasteful number, since it uses less digits than its factorization.

20660544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35887 (or 35874 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 20660544 is about 4545.3871122271. The cubic root of 20660544 is about 274.3977741520.

The spelling of 20660544 in words is "twenty million, six hundred sixty thousand, five hundred forty-four".