20655136320 has 896 divisors, whose sum is σ = 86518333440. Its totient is φ = 4056514560.

The previous prime is 20655136277. The next prime is 20655136421. The reversal of 20655136320 is 2363155602.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 78536509 + ... + 78536771.

It is an arithmetic number, because the mean of its divisors is an integer number (96560640).

Almost surely, 2^20655136320 is an apocalyptic number.

20655136320 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 20655136320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43259166720).

20655136320 is an abundant number, since it is smaller than the sum of its proper divisors (65863197120).

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

20655136320 is a wasteful number, since it uses less digits than its factorization.

20655136320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363 (or 353 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 33.

The spelling of 20655136320 in words is "twenty billion, six hundred fifty-five million, one hundred thirty-six thousand, three hundred twenty".