20535155515 has 16 divisors (see below), whose sum is σ = 28258630848. Its totient is φ = 14033183616.

The previous prime is 20535155513. The next prime is 20535155549. The reversal of 20535155515 is 51555153502.

It is a cyclic number.

It is not a de Polignac number, because 20535155515 - 2¹ = 20535155513 is a prime.

It is a super-2 number, since 2×20535155515² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20535155513) 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, 990972 + ... + 1011481.

It is an arithmetic number, because the mean of its divisors is an integer number (1766164428).

Almost surely, 2^20535155515 is an apocalyptic number.

20535155515 is a deficient number, since it is larger than the sum of its proper divisors (7723475333).

20535155515 is a wasteful number, since it uses less digits than its factorization.

20535155515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2002758.

The product of its (nonzero) digits is 93750, while the sum is 37.

The spelling of 20535155515 in words is "twenty billion, five hundred thirty-five million, one hundred fifty-five thousand, five hundred fifteen".