20520245512115 has 16 divisors (see below), whose sum is σ = 24646828500000. Its totient is φ = 16401179561472.

The previous prime is 20520245512111. The next prime is 20520245512141. The reversal of 20520245512115 is 51121554202502.

It is a cyclic number.

It is not a de Polignac number, because 20520245512115 - 2² = 20520245512111 is a prime.

It is a super-2 number, since 2×20520245512115² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20520245512111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28444136 + ... + 29156634.

It is an arithmetic number, because the mean of its divisors is an integer number (1540426781250).

Almost surely, 2^{20520245512115} is an apocalyptic number.

20520245512115 is a deficient number, since it is larger than the sum of its proper divisors (4126582987885).

20520245512115 is a wasteful number, since it uses less digits than its factorization.

20520245512115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717766.

The product of its (nonzero) digits is 40000, while the sum is 35.

Adding to 20520245512115 its reverse (51121554202502), we get a palindrome (71641799714617).

The spelling of 20520245512115 in words is "twenty trillion, five hundred twenty billion, two hundred forty-five million, five hundred twelve thousand, one hundred fifteen".