20434345513515 has 96 divisors (see below), whose sum is σ = 36358255005696. Its totient is φ = 10613881681920.

The previous prime is 20434345513487. The next prime is 20434345513529. The reversal of 20434345513515 is 51531554343402.

20434345513515 is a `hidden beast` number, since 2 + 0 + 4 + 3 + 43 + 4 + 551 + 3 + 51 + 5 = 666.

It is not a de Polignac number, because 20434345513515 - 2²² = 20434341319211 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 93757147 + ... + 93974843.

It is an arithmetic number, because the mean of its divisors is an integer number (378731822976).

Almost surely, 2^{20434345513515} is an apocalyptic number.

20434345513515 is a deficient number, since it is larger than the sum of its proper divisors (15923909492181).

20434345513515 is a wasteful number, since it uses less digits than its factorization.

20434345513515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218129 (or 218126 counting only the distinct ones).

The product of its (nonzero) digits is 2160000, while the sum is 45.

Adding to 20434345513515 its reverse (51531554343402), we get a palindrome (71965899856917).

The spelling of 20434345513515 in words is "twenty trillion, four hundred thirty-four billion, three hundred forty-five million, five hundred thirteen thousand, five hundred fifteen".