20508876505 has 16 divisors (see below), whose sum is σ = 26507028240. Its totient is φ = 15143159808.

The previous prime is 20508876503. The next prime is 20508876511. The reversal of 20508876505 is 50567880502.

It can be written as a sum of positive squares in 8 ways, for example, as 847508544 + 19661367961 = 29112^2 + 140219^2 .

It is a cyclic number.

It is not a de Polignac number, because 20508876505 - 2¹ = 20508876503 is a prime.

It is a super-2 number, since 2×20508876505² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20508876503) 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 in 15 ways as a sum of consecutive naturals, for example, 746289 + ... + 773281.

It is an arithmetic number, because the mean of its divisors is an integer number (1656689265).

Almost surely, 2^20508876505 is an apocalyptic number.

It is an amenable number.

20508876505 is a deficient number, since it is larger than the sum of its proper divisors (5998151735).

20508876505 is a wasteful number, since it uses less digits than its factorization.

20508876505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38700.

The product of its (nonzero) digits is 672000, while the sum is 46.

The spelling of 20508876505 in words is "twenty billion, five hundred eight million, eight hundred seventy-six thousand, five hundred five".