20775560 has 32 divisors (see below), whose sum is σ = 50342040. Its totient is φ = 7670784.

The previous prime is 20775541. The next prime is 20775577. The reversal of 20775560 is 6557702.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15476356 + 5299204 = 3934^2 + 2302^2 .

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, 19457 + ... + 20496.

Almost surely, 2^20775560 is an apocalyptic number.

20775560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20775560 is an abundant number, since it is smaller than the sum of its proper divisors (29566480).

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

20775560 is a wasteful number, since it uses less digits than its factorization.

20775560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39977 (or 39973 counting only the distinct ones).

The product of its (nonzero) digits is 14700, while the sum is 32.

The square root of 20775560 is about 4558.0215006075. The cubic root of 20775560 is about 274.9060174715.

The spelling of 20775560 in words is "twenty million, seven hundred seventy-five thousand, five hundred sixty".