20718771200 has 132 divisors (see below), whose sum is σ = 51491548080. Its totient is φ = 8265891840.

The previous prime is 20718771191. The next prime is 20718771211. The reversal of 20718771200 is 217781702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12875996 + ... + 12877604.

Almost surely, 2^20718771200 is an apocalyptic number.

20718771200 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 20718771200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25745774040).

20718771200 is an abundant number, since it is smaller than the sum of its proper divisors (30772776880).

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

20718771200 is a wasteful number, since it uses less digits than its factorization.

20718771200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2142 (or 2119 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 35.

The spelling of 20718771200 in words is "twenty billion, seven hundred eighteen million, seven hundred seventy-one thousand, two hundred".