20566290 has 32 divisors (see below), whose sum is σ = 50040576. Its totient is φ = 5408640.

The previous prime is 20566267. The next prime is 20566331. The reversal of 20566290 is 9266502.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2506 + ... + 6885.

It is an arithmetic number, because the mean of its divisors is an integer number (1563768).

Almost surely, 2^20566290 is an apocalyptic number.

20566290 is an abundant number, since it is smaller than the sum of its proper divisors (29474286).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20566290 is a wasteful number, since it uses less digits than its factorization.

20566290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9474.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 20566290 is about 4535.0071664772. The cubic root of 20566290 is about 273.9798678088.

The spelling of 20566290 in words is "twenty million, five hundred sixty-six thousand, two hundred ninety".