20868342336 has 196 divisors, whose sum is σ = 64790311872. Its totient is φ = 6653332224.

The previous prime is 20868342311. The next prime is 20868342337. The reversal of 20868342336 is 63324386802.

It is a junction number, because it is equal to n+sod(n) for n = 20868342291 and 20868342300.

It is not an unprimeable number, because it can be changed into a prime (20868342337) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1063365 + ... + 1082811.

Almost surely, 2^20868342336 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20868342336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32395155936).

20868342336 is an abundant number, since it is smaller than the sum of its proper divisors (43921969536).

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

20868342336 is an equidigital number, since it uses as much as digits as its factorization.

20868342336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19500 (or 19475 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 45.

The spelling of 20868342336 in words is "twenty billion, eight hundred sixty-eight million, three hundred forty-two thousand, three hundred thirty-six".