20863340868 has 72 divisors (see below), whose sum is σ = 51604956480. Its totient is φ = 6559341120.

The previous prime is 20863340867. The next prime is 20863340879. The reversal of 20863340868 is 86804336802.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20863340867) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 981513 + ... + 1002543.

Almost surely, 2^20863340868 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 20863340868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25802478240).

20863340868 is an abundant number, since it is smaller than the sum of its proper divisors (30741615612).

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

20863340868 is a wasteful number, since it uses less digits than its factorization.

20863340868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21305 (or 21284 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 48.

The spelling of 20863340868 in words is "twenty billion, eight hundred sixty-three million, three hundred forty thousand, eight hundred sixty-eight".