20562090 has 32 divisors (see below), whose sum is σ = 50189760. Its totient is φ = 5389824.

The previous prime is 20562089. The next prime is 20562103. The reversal of 20562090 is 9026502.

It is a self number, because there is not a number n which added to its sum of digits gives 20562090.

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, 4039 + ... + 7578.

It is an arithmetic number, because the mean of its divisors is an integer number (1568430).

Almost surely, 2^20562090 is an apocalyptic number.

20562090 is an abundant number, since it is smaller than the sum of its proper divisors (29627670).

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

20562090 is a wasteful number, since it uses less digits than its factorization.

20562090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11686.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 20562090 is about 4534.5440785155. The cubic root of 20562090 is about 273.9612160282.

Adding to 20562090 its reverse (9026502), we get a palindrome (29588592).

The spelling of 20562090 in words is "twenty million, five hundred sixty-two thousand, ninety".