20205890 has 32 divisors (see below), whose sum is σ = 37324800. Its totient is φ = 7873600.

The previous prime is 20205883. The next prime is 20205901. The reversal of 20205890 is 9850202.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105695 + ... + 105885.

It is an arithmetic number, because the mean of its divisors is an integer number (1166400).

Almost surely, 2^20205890 is an apocalyptic number.

20205890 is a deficient number, since it is larger than the sum of its proper divisors (17118910).

20205890 is a wasteful number, since it uses less digits than its factorization.

20205890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 20205890 is about 4495.0962169902. The cubic root of 20205890 is about 272.3700359412.

The spelling of 20205890 in words is "twenty million, two hundred five thousand, eight hundred ninety".