20782635808 has 24 divisors (see below), whose sum is σ = 44635434480. Its totient is φ = 9446652480.

The previous prime is 20782635791. The next prime is 20782635821. The reversal of 20782635808 is 80853628702.

It is a happy number.

It is a super-2 number, since 2×20782635808² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29520438 + ... + 29521141.

It is an arithmetic number, because the mean of its divisors is an integer number (1859809770).

Almost surely, 2^20782635808 is an apocalyptic number.

It is an amenable number.

20782635808 is an abundant number, since it is smaller than the sum of its proper divisors (23852798672).

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

20782635808 is a wasteful number, since it uses less digits than its factorization.

20782635808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59041600 (or 59041592 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 49.

The spelling of 20782635808 in words is "twenty billion, seven hundred eighty-two million, six hundred thirty-five thousand, eight hundred eight".