20655451320 has 128 divisors (see below), whose sum is σ = 70877030400. Its totient is φ = 4717357056.

The previous prime is 20655451303. The next prime is 20655451321. The reversal of 20655451320 is 2315455602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20655451321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1080001 + ... + 1098959.

It is an arithmetic number, because the mean of its divisors is an integer number (553726800).

Almost surely, 2^20655451320 is an apocalyptic number.

20655451320 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 20655451320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35438515200).

20655451320 is an abundant number, since it is smaller than the sum of its proper divisors (50221579080).

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

20655451320 is a wasteful number, since it uses less digits than its factorization.

20655451320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20277 (or 20273 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

The spelling of 20655451320 in words is "twenty billion, six hundred fifty-five million, four hundred fifty-one thousand, three hundred twenty".