20308455552 has 256 divisors, whose sum is σ = 68823659520. Its totient is φ = 5151928320.

The previous prime is 20308455551. The next prime is 20308455569. The reversal of 20308455552 is 25555480302.

It is a self number, because there is not a number n which added to its sum of digits gives 20308455552.

It is not an unprimeable number, because it can be changed into a prime (20308455551) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1263438 + ... + 1279410.

It is an arithmetic number, because the mean of its divisors is an integer number (268842420).

Almost surely, 2^20308455552 is an apocalyptic number.

20308455552 is a gapful number since it is divisible by the number (22) 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 20308455552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34411829760).

20308455552 is an abundant number, since it is smaller than the sum of its proper divisors (48515203968).

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

20308455552 is a wasteful number, since it uses less digits than its factorization.

20308455552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16051 (or 16039 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 39.

The spelling of 20308455552 in words is "twenty billion, three hundred eight million, four hundred fifty-five thousand, five hundred fifty-two".