20708861388600 has 384 divisors, whose sum is σ = 80444726208000. Its totient is φ = 4281294796800.

The previous prime is 20708861388497. The next prime is 20708861388629. The reversal of 20708861388600 is 688316880702.

It is a happy number.

It is a Cunningham number, because it is equal to 4550699²-1.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7963726 + ... + 10239074.

It is an arithmetic number, because the mean of its divisors is an integer number (209491474500).

Almost surely, 2^{20708861388600} is an apocalyptic number.

20708861388600 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 20708861388600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40222363104000).

20708861388600 is an abundant number, since it is smaller than the sum of its proper divisors (59735864819400).

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

20708861388600 is a wasteful number, since it uses less digits than its factorization.

20708861388600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2275583 (or 2275574 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 57.

The spelling of 20708861388600 in words is "twenty trillion, seven hundred eight billion, eight hundred sixty-one million, three hundred eighty-eight thousand, six hundred".