20783552790 has 256 divisors, whose sum is σ = 69886623744. Its totient is φ = 3813004800.

The previous prime is 20783552789. The next prime is 20783552809. The reversal of 20783552790 is 9725538702.

It is a happy number.

It is a congruent number.

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 127 ways as a sum of consecutive naturals, for example, 675645 + ... + 705735.

It is an arithmetic number, because the mean of its divisors is an integer number (272994624).

Almost surely, 2^20783552790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20783552790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34943311872).

20783552790 is an abundant number, since it is smaller than the sum of its proper divisors (49103070954).

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

20783552790 is a wasteful number, since it uses less digits than its factorization.

20783552790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30155.

The product of its (nonzero) digits is 1058400, while the sum is 48.

The spelling of 20783552790 in words is "twenty billion, seven hundred eighty-three million, five hundred fifty-two thousand, seven hundred ninety".