20502535511 has 2 divisors, whose sum is σ = 20502535512. Its totient is φ = 20502535510.

The previous prime is 20502535489. The next prime is 20502535519. The reversal of 20502535511 is 11553520502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20502535511 - 2²⁶ = 20435426647 is a prime.

It is a super-2 number, since 2×20502535511² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20502535519) 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 as a sum of consecutive naturals, namely, 10251267755 + 10251267756.

It is an arithmetic number, because the mean of its divisors is an integer number (10251267756).

Almost surely, 2^20502535511 is an apocalyptic number.

20502535511 is a deficient number, since it is larger than the sum of its proper divisors (1).

20502535511 is an equidigital number, since it uses as much as digits as its factorization.

20502535511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7500, while the sum is 29.

The spelling of 20502535511 in words is "twenty billion, five hundred two million, five hundred thirty-five thousand, five hundred eleven".