20553644 has 12 divisors (see below), whose sum is σ = 36054984. Its totient is φ = 10252224.

The previous prime is 20553623. The next prime is 20553647. The reversal of 20553644 is 44635502.

It is not an unprimeable number, because it can be changed into a prime (20553647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4202 + ... + 7665.

It is an arithmetic number, because the mean of its divisors is an integer number (3004582).

Almost surely, 2^20553644 is an apocalyptic number.

It is an amenable number.

20553644 is a deficient number, since it is larger than the sum of its proper divisors (15501340).

20553644 is a wasteful number, since it uses less digits than its factorization.

20553644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12304 (or 12302 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 29.

The square root of 20553644 is about 4533.6126874712. The cubic root of 20553644 is about 273.9237004950.

The spelling of 20553644 in words is "twenty million, five hundred fifty-three thousand, six hundred forty-four".