20563776 has 84 divisors (see below), whose sum is σ = 62077600. Its totient is φ = 6490368.

The previous prime is 20563759. The next prime is 20563793. The reversal of 20563776 is 67736502.

It is a happy number.

20563776 is a `hidden beast` number, since 20 + 563 + 7 + 76 = 666.

It is an interprime number because it is at equal distance from previous prime (20563759) and next prime (20563793).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20563776.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10005 + ... + 11883.

Almost surely, 2^20563776 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20563776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31038800).

20563776 is an abundant number, since it is smaller than the sum of its proper divisors (41513824).

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

20563776 is a wasteful number, since it uses less digits than its factorization.

20563776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1916 (or 1903 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 36.

The square root of 20563776 is about 4534.7299809360. The cubic root of 20563776 is about 273.9687036910.

It can be divided in two parts, 2056 and 3776, that added together give a cube (5832 = 18³).

The spelling of 20563776 in words is "twenty million, five hundred sixty-three thousand, seven hundred seventy-six".