20865080 has 32 divisors (see below), whose sum is σ = 47109600. Its totient is φ = 8317056.

The previous prime is 20865067. The next prime is 20865083. The reversal of 20865080 is 8056802.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20865083) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 13634 + ... + 15086.

It is an arithmetic number, because the mean of its divisors is an integer number (1472175).

Almost surely, 2^20865080 is an apocalyptic number.

20865080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20865080 is an abundant number, since it is smaller than the sum of its proper divisors (26244520).

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

20865080 is a wasteful number, since it uses less digits than its factorization.

20865080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1823 (or 1819 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 20865080 is about 4567.8309951223. The cubic root of 20865080 is about 275.3003000521.

The spelling of 20865080 in words is "twenty million, eight hundred sixty-five thousand, eighty".