20553601 has 8 divisors (see below), whose sum is σ = 20882664. Its totient is φ = 20227200.

The previous prime is 20553583. The next prime is 20553607. The reversal of 20553601 is 10635502.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 19149376 + 1404225 = 4376^2 + 1185^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20553601 - 2⁵ = 20553569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20553607) 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 7 ways as a sum of consecutive naturals, for example, 19381 + ... + 20413.

It is an arithmetic number, because the mean of its divisors is an integer number (2610333).

Almost surely, 2^20553601 is an apocalyptic number.

It is an amenable number.

20553601 is a deficient number, since it is larger than the sum of its proper divisors (329063).

20553601 is a wasteful number, since it uses less digits than its factorization.

20553601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 20553601 is about 4533.6079451139. The cubic root of 20553601 is about 273.9235094708.

The spelling of 20553601 in words is "twenty million, five hundred fifty-three thousand, six hundred one".