20415512113511 has 16 divisors (see below), whose sum is σ = 22155918597120. Its totient is φ = 18761059991520.

The previous prime is 20415512113501. The next prime is 20415512113519. The reversal of 20415512113511 is 11531121551402.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20415512113511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20415512113519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169141151 + ... + 169261808.

It is an arithmetic number, because the mean of its divisors is an integer number (1384744912320).

Almost surely, 2^{20415512113511} is an apocalyptic number.

20415512113511 is a deficient number, since it is larger than the sum of its proper divisors (1740406483609).

20415512113511 is a wasteful number, since it uses less digits than its factorization.

20415512113511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338403086.

The product of its (nonzero) digits is 6000, while the sum is 32.

Adding to 20415512113511 its reverse (11531121551402), we get a palindrome (31946633664913).

The spelling of 20415512113511 in words is "twenty trillion, four hundred fifteen billion, five hundred twelve million, one hundred thirteen thousand, five hundred eleven".