20552645 has 8 divisors (see below), whose sum is σ = 24698520. Its totient is φ = 16418560.

The previous prime is 20552629. The next prime is 20552647. The reversal of 20552645 is 54625502.

It can be written as a sum of positive squares in 4 ways, for example, as 2217121 + 18335524 = 1489^2 + 4282^2 .

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

It is not a de Polignac number, because 20552645 - 2⁴ = 20552629 is a prime.

It is a super-2 number, since 2×20552645² = 844822432992050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20552647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1505 + ... + 6585.

It is an arithmetic number, because the mean of its divisors is an integer number (3087315).

Almost surely, 2^20552645 is an apocalyptic number.

It is an amenable number.

20552645 is a deficient number, since it is larger than the sum of its proper divisors (4145875).

20552645 is an equidigital number, since it uses as much as digits as its factorization.

20552645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5895.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 20552645 is about 4533.5025090982. The cubic root of 20552645 is about 273.9192624464.

The spelling of 20552645 in words is "twenty million, five hundred fifty-two thousand, six hundred forty-five".