20856244800 has 168 divisors, whose sum is σ = 68966665216. Its totient is φ = 5517711360.

The previous prime is 20856244789. The next prime is 20856244813. The reversal of 20856244800 is 844265802.

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, 592494 + ... + 626706.

Almost surely, 2^20856244800 is an apocalyptic number.

20856244800 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 20856244800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34483332608).

20856244800 is an abundant number, since it is smaller than the sum of its proper divisors (48110420416).

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

20856244800 is a wasteful number, since it uses less digits than its factorization.

20856244800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34365 (or 34350 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 39.

The spelling of 20856244800 in words is "twenty billion, eight hundred fifty-six million, two hundred forty-four thousand, eight hundred".