20836880 has 20 divisors (see below), whose sum is σ = 48445932. Its totient is φ = 8334720.

The previous prime is 20836847. The next prime is 20836889. The reversal of 20836880 is 8863802.

It can be written as a sum of positive squares in 2 ways, for example, as 16032016 + 4804864 = 4004^2 + 2192^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 20836880.

It is not an unprimeable number, because it can be changed into a prime (20836889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130151 + ... + 130310.

Almost surely, 2^20836880 is an apocalyptic number.

20836880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20836880 is an abundant number, since it is smaller than the sum of its proper divisors (27609052).

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

20836880 is a wasteful number, since it uses less digits than its factorization.

20836880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260474 (or 260468 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 20836880 is about 4564.7431472099. The cubic root of 20836880 is about 275.1762176356.

The spelling of 20836880 in words is "twenty million, eight hundred thirty-six thousand, eight hundred eighty".