20741680 has 20 divisors (see below), whose sum is σ = 48224592. Its totient is φ = 8296640.

The previous prime is 20741621. The next prime is 20741713. The reversal of 20741680 is 8614702.

It is a tau number, because it is divible by the number of its divisors (20).

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 3 ways as a sum of consecutive naturals, for example, 129556 + ... + 129715.

Almost surely, 2^20741680 is an apocalyptic number.

20741680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20741680 is an abundant number, since it is smaller than the sum of its proper divisors (27482912).

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

20741680 is a wasteful number, since it uses less digits than its factorization.

20741680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259284 (or 259278 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 20741680 is about 4554.3034593668. The cubic root of 20741680 is about 274.7565007102.

The spelling of 20741680 in words is "twenty million, seven hundred forty-one thousand, six hundred eighty".