20899760 has 40 divisors (see below), whose sum is σ = 55535136. Its totient is φ = 7165440.

The previous prime is 20899757. The next prime is 20899789. The reversal of 20899760 is 6799802.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18101 + ... + 19220.

Almost surely, 2^20899760 is an apocalyptic number.

20899760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20899760 is an abundant number, since it is smaller than the sum of its proper divisors (34635376).

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

20899760 is a wasteful number, since it uses less digits than its factorization.

20899760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37341 (or 37335 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 20899760 is about 4571.6255314713. The cubic root of 20899760 is about 275.4527418300.

The spelling of 20899760 in words is "twenty million, eight hundred ninety-nine thousand, seven hundred sixty".