20303013440 has 28 divisors (see below), whose sum is σ = 48346551516. Its totient is φ = 8121205248.

The previous prime is 20303013421. The next prime is 20303013461. The reversal of 20303013440 is 4431030302.

It can be written as a sum of positive squares in 2 ways, for example, as 11719361536 + 8583651904 = 108256^2 + 92648^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31723139 + ... + 31723778.

Almost surely, 2^20303013440 is an apocalyptic number.

20303013440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20303013440 is an abundant number, since it is smaller than the sum of its proper divisors (28043538076).

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

20303013440 is an equidigital number, since it uses as much as digits as its factorization.

20303013440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63446934 (or 63446924 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 20303013440 its reverse (4431030302), we get a palindrome (24734043742).

The spelling of 20303013440 in words is "twenty billion, three hundred three million, thirteen thousand, four hundred forty".