20455530788 has 144 divisors (see below), whose sum is σ = 46118016000. Its totient is φ = 7872590880.

The previous prime is 20455530787. The next prime is 20455530791. The reversal of 20455530788 is 88703555402.

It is not an unprimeable number, because it can be changed into a prime (20455530787) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 102791513 + ... + 102791711.

It is an arithmetic number, because the mean of its divisors is an integer number (320264000).

Almost surely, 2^20455530788 is an apocalyptic number.

20455530788 is a gapful number since it is divisible by the number (28) 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 20455530788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23059008000).

20455530788 is an abundant number, since it is smaller than the sum of its proper divisors (25662485212).

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

20455530788 is a wasteful number, since it uses less digits than its factorization.

20455530788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388 (or 358 counting only the distinct ones).

The product of its (nonzero) digits is 1344000, while the sum is 47.

The spelling of 20455530788 in words is "twenty billion, four hundred fifty-five million, five hundred thirty thousand, seven hundred eighty-eight".