20770729320 has 192 divisors, whose sum is σ = 72097704000. Its totient is φ = 4770247680.

The previous prime is 20770729307. The next prime is 20770729351. The reversal of 20770729320 is 2392707702.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 238236 + ... + 313524.

It is an arithmetic number, because the mean of its divisors is an integer number (375508875).

Almost surely, 2^20770729320 is an apocalyptic number.

20770729320 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 20770729320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36048852000).

20770729320 is an abundant number, since it is smaller than the sum of its proper divisors (51326974680).

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

20770729320 is a wasteful number, since it uses less digits than its factorization.

20770729320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75344 (or 75329 counting only the distinct ones).

The product of its (nonzero) digits is 74088, while the sum is 39.

The spelling of 20770729320 in words is "twenty billion, seven hundred seventy million, seven hundred twenty-nine thousand, three hundred twenty".