20552566 has 32 divisors (see below), whose sum is σ = 34099200. Its totient is φ = 9253440.

The previous prime is 20552563. The next prime is 20552579. The reversal of 20552566 is 66525502.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20552563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85875 + ... + 86113.

It is an arithmetic number, because the mean of its divisors is an integer number (1065600).

Almost surely, 2^20552566 is an apocalyptic number.

20552566 is a deficient number, since it is larger than the sum of its proper divisors (13546634).

20552566 is a wasteful number, since it uses less digits than its factorization.

20552566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 20552566 is about 4533.4937961797. The cubic root of 20552566 is about 273.9189114835.

The spelling of 20552566 in words is "twenty million, five hundred fifty-two thousand, five hundred sixty-six".