20170980 has 36 divisors (see below), whose sum is σ = 61185852. Its totient is φ = 5378880.

The previous prime is 20170963. The next prime is 20171017. The reversal of 20170980 is 8907102.

It can be written as a sum of positive squares in 2 ways, for example, as 13483584 + 6687396 = 3672^2 + 2586^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55851 + ... + 56210.

It is an arithmetic number, because the mean of its divisors is an integer number (1699607).

Almost surely, 2^20170980 is an apocalyptic number.

20170980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20170980 is an abundant number, since it is smaller than the sum of its proper divisors (41014872).

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

20170980 is a wasteful number, since it uses less digits than its factorization.

20170980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112076 (or 112071 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 20170980 is about 4491.2114178693. The cubic root of 20170980 is about 272.2130863394.

The spelling of 20170980 in words is "twenty million, one hundred seventy thousand, nine hundred eighty".