20556782 has 16 divisors (see below), whose sum is σ = 32085504. Its totient is φ = 9867000.

The previous prime is 20556769. The next prime is 20556787. The reversal of 20556782 is 28765502.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20556787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6857 + ... + 9387.

It is an arithmetic number, because the mean of its divisors is an integer number (2005344).

Almost surely, 2^20556782 is an apocalyptic number.

20556782 is a deficient number, since it is larger than the sum of its proper divisors (11528722).

20556782 is a wasteful number, since it uses less digits than its factorization.

20556782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2695.

The product of its (nonzero) digits is 33600, while the sum is 35.

The square root of 20556782 is about 4533.9587558777. The cubic root of 20556782 is about 273.9376400966.

The spelling of 20556782 in words is "twenty million, five hundred fifty-six thousand, seven hundred eighty-two".