20115240331 has 2 divisors, whose sum is σ = 20115240332. Its totient is φ = 20115240330.

The previous prime is 20115240323. The next prime is 20115240371. The reversal of 20115240331 is 13304251102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20115240331 - 2³ = 20115240323 is a prime.

It is a super-2 number, since 2×20115240331² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20115240311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10057620165 + 10057620166.

It is an arithmetic number, because the mean of its divisors is an integer number (10057620166).

Almost surely, 2^20115240331 is an apocalyptic number.

20115240331 is a deficient number, since it is larger than the sum of its proper divisors (1).

20115240331 is an equidigital number, since it uses as much as digits as its factorization.

20115240331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 20115240331 its reverse (13304251102), we get a palindrome (33419491433).

The spelling of 20115240331 in words is "twenty billion, one hundred fifteen million, two hundred forty thousand, three hundred thirty-one".