20563760 has 40 divisors (see below), whose sum is σ = 54642336. Its totient is φ = 7050240.

The previous prime is 20563759. The next prime is 20563793. The reversal of 20563760 is 6736502.

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, 17801 + ... + 18920.

Almost surely, 2^20563760 is an apocalyptic number.

20563760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20563760 is an abundant number, since it is smaller than the sum of its proper divisors (34078576).

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

20563760 is a wasteful number, since it uses less digits than its factorization.

20563760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36741 (or 36735 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 29.

The square root of 20563760 is about 4534.7282167733. The cubic root of 20563760 is about 273.9686326356.

The spelling of 20563760 in words is "twenty million, five hundred sixty-three thousand, seven hundred sixty".