20516521263 has 16 divisors (see below), whose sum is σ = 31928448000. Its totient is φ = 11474284896.

The previous prime is 20516521253. The next prime is 20516521273. The reversal of 20516521263 is 36212561502.

It is an interprime number because it is at equal distance from previous prime (20516521253) and next prime (20516521273).

It is not a de Polignac number, because 20516521263 - 2²¹ = 20514424111 is a prime.

It is a super-2 number, since 2×20516521263² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20516521253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10392388 + ... + 10394361.

It is an arithmetic number, because the mean of its divisors is an integer number (1995528000).

Almost surely, 2^20516521263 is an apocalyptic number.

20516521263 is a deficient number, since it is larger than the sum of its proper divisors (11411926737).

20516521263 is a wasteful number, since it uses less digits than its factorization.

20516521263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20786806.

The product of its (nonzero) digits is 21600, while the sum is 33.

The spelling of 20516521263 in words is "twenty billion, five hundred sixteen million, five hundred twenty-one thousand, two hundred sixty-three".