20886580 has 96 divisors (see below), whose sum is σ = 52778880. Its totient is φ = 6842880.

The previous prime is 20886571. The next prime is 20886587. The reversal of 20886580 is 8568802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20886587) 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 31 ways as a sum of consecutive naturals, for example, 191566 + ... + 191674.

It is an arithmetic number, because the mean of its divisors is an integer number (549780).

Almost surely, 2^20886580 is an apocalyptic number.

20886580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20886580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26389440).

20886580 is an abundant number, since it is smaller than the sum of its proper divisors (31892300).

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

20886580 is a wasteful number, since it uses less digits than its factorization.

20886580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 20886580 is about 4570.1838037436. The cubic root of 20886580 is about 275.3948268019.

It can be divided in two parts, 2088 and 6580, that added together give a palindrome (8668).

The spelling of 20886580 in words is "twenty million, eight hundred eighty-six thousand, five hundred eighty".