20173680 has 60 divisors (see below), whose sum is σ = 67752360. Its totient is φ = 5379456.

The previous prime is 20173663. The next prime is 20173697. The reversal of 20173680 is 8637102.

It is an interprime number because it is at equal distance from previous prime (20173663) and next prime (20173697).

It is a tau number, because it is divible by the number of its divisors (60).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13290 + ... + 14729.

It is an arithmetic number, because the mean of its divisors is an integer number (1129206).

Almost surely, 2^20173680 is an apocalyptic number.

20173680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20173680 is an abundant number, since it is smaller than the sum of its proper divisors (47578680).

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

20173680 is a wasteful number, since it uses less digits than its factorization.

20173680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28038 (or 28029 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20173680 is about 4491.5119948632. The cubic root of 20173680 is about 272.2252315523.

The spelling of 20173680 in words is "twenty million, one hundred seventy-three thousand, six hundred eighty".