20115015345 has 24 divisors (see below), whose sum is σ = 35067577896. Its totient is φ = 10665992448.

The previous prime is 20115015343. The next prime is 20115015439. The reversal of 20115015345 is 54351051102.

It can be written as a sum of positive squares in 4 ways, for example, as 7594076736 + 12520938609 = 87144^2 + 111897^2 .

It is not a de Polignac number, because 20115015345 - 2¹ = 20115015343 is a prime.

It is a super-2 number, since 2×20115015345² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20115015341) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1284124 + ... + 1299693.

It is an arithmetic number, because the mean of its divisors is an integer number (1461149079).

Almost surely, 2^20115015345 is an apocalyptic number.

It is an amenable number.

20115015345 is a deficient number, since it is larger than the sum of its proper divisors (14952562551).

20115015345 is a wasteful number, since it uses less digits than its factorization.

20115015345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2584001 (or 2583998 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

Adding to 20115015345 its reverse (54351051102), we get a palindrome (74466066447).

The spelling of 20115015345 in words is "twenty billion, one hundred fifteen million, fifteen thousand, three hundred forty-five".