20680751840 has 144 divisors (see below), whose sum is σ = 57088281600. Its totient is φ = 7058967552.

The previous prime is 20680751827. The next prime is 20680751881. The reversal of 20680751840 is 4815708602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1789601 + ... + 1801119.

It is an arithmetic number, because the mean of its divisors is an integer number (396446400).

Almost surely, 2^20680751840 is an apocalyptic number.

20680751840 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 20680751840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28544140800).

20680751840 is an abundant number, since it is smaller than the sum of its proper divisors (36407529760).

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

20680751840 is a wasteful number, since it uses less digits than its factorization.

20680751840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11777 (or 11762 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 41.

The spelling of 20680751840 in words is "twenty billion, six hundred eighty million, seven hundred fifty-one thousand, eight hundred forty".