20183680 has 128 divisors (see below), whose sum is σ = 54639360. Its totient is φ = 7065600.

The previous prime is 20183677. The next prime is 20183693. The reversal of 20183680 is 8638102.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 330850 + ... + 330910.

It is an arithmetic number, because the mean of its divisors is an integer number (426870).

Almost surely, 2^20183680 is an apocalyptic number.

20183680 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 20183680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27319680).

20183680 is an abundant number, since it is smaller than the sum of its proper divisors (34455680).

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

20183680 is a wasteful number, since it uses less digits than its factorization.

20183680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 20183680 is about 4492.6250678195. The cubic root of 20183680 is about 272.2702043855.

The spelling of 20183680 in words is "twenty million, one hundred eighty-three thousand, six hundred eighty".