20203155520 has 56 divisors (see below), whose sum is σ = 48175493184. Its totient is φ = 8070053376.

The previous prime is 20203155509. The next prime is 20203155529. The reversal of 20203155520 is 2555130202.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20203155529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189219 + ... + 276061.

It is an arithmetic number, because the mean of its divisors is an integer number (860276664).

Almost surely, 2^20203155520 is an apocalyptic number.

20203155520 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 20203155520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24087746592).

20203155520 is an abundant number, since it is smaller than the sum of its proper divisors (27972337664).

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

20203155520 is an equidigital number, since it uses as much as digits as its factorization.

20203155520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87587 (or 87577 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

Adding to 20203155520 its reverse (2555130202), we get a palindrome (22758285722).

The spelling of 20203155520 in words is "twenty billion, two hundred three million, one hundred fifty-five thousand, five hundred twenty".