20303155320 has 128 divisors (see below), whose sum is σ = 70249766400. Its totient is φ = 4598125056.

The previous prime is 20303155303. The next prime is 20303155321. The reversal of 20303155320 is 2355130302.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20303155321) 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, 19314 + ... + 202433.

It is an arithmetic number, because the mean of its divisors is an integer number (548826300).

Almost surely, 2^20303155320 is an apocalyptic number.

20303155320 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 20303155320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35124883200).

20303155320 is an abundant number, since it is smaller than the sum of its proper divisors (49946611080).

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

20303155320 is a wasteful number, since it uses less digits than its factorization.

20303155320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221877 (or 221873 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 24.

Adding to 20303155320 its reverse (2355130302), we get a palindrome (22658285622).

The spelling of 20303155320 in words is "twenty billion, three hundred three million, one hundred fifty-five thousand, three hundred twenty".