20791776720 has 320 divisors, whose sum is σ = 75919140864. Its totient is φ = 4640655360.

The previous prime is 20791776701. The next prime is 20791776721. The reversal of 20791776720 is 2767719702.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 20791776720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20791776721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23440117 + ... + 23441003.

Almost surely, 2^20791776720 is an apocalyptic number.

20791776720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20791776720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37959570432).

20791776720 is an abundant number, since it is smaller than the sum of its proper divisors (55127364144).

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

20791776720 is a wasteful number, since it uses less digits than its factorization.

20791776720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1610 (or 1604 counting only the distinct ones).

The product of its (nonzero) digits is 518616, while the sum is 48.

The spelling of 20791776720 in words is "twenty billion, seven hundred ninety-one million, seven hundred seventy-six thousand, seven hundred twenty".