20560890 has 96 divisors (see below), whose sum is σ = 58506624. Its totient is φ = 4609920.

The previous prime is 20560889. The next prime is 20560901. The reversal of 20560890 is 9806502.

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 104272 + ... + 104468.

It is an arithmetic number, because the mean of its divisors is an integer number (609444).

Almost surely, 2^20560890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20560890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29253312).

20560890 is an abundant number, since it is smaller than the sum of its proper divisors (37945734).

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

20560890 is a wasteful number, since it uses less digits than its factorization.

20560890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292 (or 285 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 20560890 is about 4534.4117589826. The cubic root of 20560890 is about 273.9558864816.

The spelling of 20560890 in words is "twenty million, five hundred sixty thousand, eight hundred ninety".