20720729760 has 192 divisors, whose sum is σ = 66102220800. Its totient is φ = 5455475712.

The previous prime is 20720729753. The next prime is 20720729797. The reversal of 20720729760 is 6792702702.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22546581 + ... + 22547499.

It is an arithmetic number, because the mean of its divisors is an integer number (344282400).

Almost surely, 2^20720729760 is an apocalyptic number.

20720729760 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 20720729760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33051110400).

20720729760 is an abundant number, since it is smaller than the sum of its proper divisors (45381491040).

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

20720729760 is a wasteful number, since it uses less digits than its factorization.

20720729760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1483 (or 1475 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 42.

The spelling of 20720729760 in words is "twenty billion, seven hundred twenty million, seven hundred twenty-nine thousand, seven hundred sixty".