20115332240 has 20 divisors (see below), whose sum is σ = 46768147644. Its totient is φ = 8046132864.

The previous prime is 20115332231. The next prime is 20115332267. The reversal of 20115332240 is 4223351102.

It can be written as a sum of positive squares in 2 ways, for example, as 11858338816 + 8256993424 = 108896^2 + 90868^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×20115332240² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125720747 + ... + 125720906.

Almost surely, 2^20115332240 is an apocalyptic number.

20115332240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20115332240 is an abundant number, since it is smaller than the sum of its proper divisors (26652815404).

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

20115332240 is a wasteful number, since it uses less digits than its factorization.

20115332240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251441666 (or 251441660 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 20115332240 its reverse (4223351102), we get a palindrome (24338683342).

The spelling of 20115332240 in words is "twenty billion, one hundred fifteen million, three hundred thirty-two thousand, two hundred forty".