20664180 has 96 divisors (see below), whose sum is σ = 68100480. Its totient is φ = 5184000.

The previous prime is 20664139. The next prime is 20664239. The reversal of 20664180 is 8146602.

20664180 is nontrivially palindromic in base 13.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8055 + ... + 10305.

It is an arithmetic number, because the mean of its divisors is an integer number (709380).

Almost surely, 2^20664180 is an apocalyptic number.

20664180 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 20664180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34050240).

20664180 is an abundant number, since it is smaller than the sum of its proper divisors (47436300).

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

20664180 is a wasteful number, since it uses less digits than its factorization.

20664180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2286 (or 2278 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 20664180 is about 4545.7870605650. The cubic root of 20664180 is about 274.4138700784.

The spelling of 20664180 in words is "twenty million, six hundred sixty-four thousand, one hundred eighty".