20704680 has 128 divisors (see below), whose sum is σ = 72720000. Its totient is φ = 5225472.

The previous prime is 20704639. The next prime is 20704687. The reversal of 20704680 is 8640702.

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

It is not an unprimeable number, because it can be changed into a prime (20704687) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20016 + ... + 21024.

It is an arithmetic number, because the mean of its divisors is an integer number (568125).

Almost surely, 2^20704680 is an apocalyptic number.

20704680 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 20704680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36360000).

20704680 is an abundant number, since it is smaller than the sum of its proper divisors (52015320).

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

20704680 is a wasteful number, since it uses less digits than its factorization.

20704680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048 (or 1038 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20704680 is about 4550.2395541334. The cubic root of 20704680 is about 274.5930288766.

The spelling of 20704680 in words is "twenty million, seven hundred four thousand, six hundred eighty".