20085580 has 12 divisors (see below), whose sum is σ = 42179760. Its totient is φ = 8034224.

The previous prime is 20085577. The next prime is 20085589. The reversal of 20085580 is 8558002.

It is not an unprimeable number, because it can be changed into a prime (20085589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 502120 + ... + 502159.

It is an arithmetic number, because the mean of its divisors is an integer number (3514980).

Almost surely, 2^20085580 is an apocalyptic number.

20085580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20085580 is an abundant number, since it is smaller than the sum of its proper divisors (22094180).

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

20085580 is a wasteful number, since it uses less digits than its factorization.

20085580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004288 (or 1004286 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 20085580 is about 4481.6938762035. The cubic root of 20085580 is about 271.8283771729.

The spelling of 20085580 in words is "twenty million, eighty-five thousand, five hundred eighty".