20552545 has 8 divisors (see below), whose sum is σ = 26560296. Its totient is φ = 15177216.

The previous prime is 20552533. The next prime is 20552549. The reversal of 20552545 is 54525502.

It can be written as a sum of positive squares in 4 ways, for example, as 1183744 + 19368801 = 1088^2 + 4401^2 .

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 20552545 - 2⁵ = 20552513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20552549) 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, 158032 + ... + 158161.

It is an arithmetic number, because the mean of its divisors is an integer number (3320037).

Almost surely, 2^20552545 is an apocalyptic number.

It is an amenable number.

20552545 is a deficient number, since it is larger than the sum of its proper divisors (6007751).

20552545 is a wasteful number, since it uses less digits than its factorization.

20552545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316211.

The product of its (nonzero) digits is 10000, while the sum is 28.

The square root of 20552545 is about 4533.4914800846. The cubic root of 20552545 is about 273.9188181894.

The spelling of 20552545 in words is "twenty million, five hundred fifty-two thousand, five hundred forty-five".