20656782 has 40 divisors (see below), whose sum is σ = 47288736. Its totient is φ = 6736608.

The previous prime is 20656777. The next prime is 20656799. The reversal of 20656782 is 28765602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6258 + ... + 8970.

Almost surely, 2^20656782 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20656782, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23644368).

20656782 is an abundant number, since it is smaller than the sum of its proper divisors (26631954).

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

20656782 is a wasteful number, since it uses less digits than its factorization.

20656782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2774 (or 2765 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 20656782 is about 4544.9732672481. The cubic root of 20656782 is about 274.3811184581.

The spelling of 20656782 in words is "twenty million, six hundred fifty-six thousand, seven hundred eighty-two".