20553764 has 24 divisors (see below), whose sum is σ = 44845248. Its totient is φ = 8007840.

The previous prime is 20553739. The next prime is 20553773. The reversal of 20553764 is 46735502.

It is a self number, because there is not a number n which added to its sum of digits gives 20553764.

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, 33059 + ... + 33674.

It is an arithmetic number, because the mean of its divisors is an integer number (1868552).

Almost surely, 2^20553764 is an apocalyptic number.

It is an amenable number.

20553764 is an abundant number, since it is smaller than the sum of its proper divisors (24291484).

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

20553764 is a wasteful number, since it uses less digits than its factorization.

20553764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66755 (or 66753 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 32.

The square root of 20553764 is about 4533.6259219305. The cubic root of 20553764 is about 273.9242335842.

The spelling of 20553764 in words is "twenty million, five hundred fifty-three thousand, seven hundred sixty-four".