20518209268210 has 16 divisors (see below), whose sum is σ = 37259615416536. Its totient is φ = 8134652877568.

The previous prime is 20518209268187. The next prime is 20518209268229. The reversal of 20518209268210 is 1286290281502.

It is a Cunningham number, because it is equal to 4529703²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 7386550988041 + 13131658280169 = 2717821^2 + 3623763^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9078852529 + ... + 9078854788.

Almost surely, 2^{20518209268210} is an apocalyptic number.

20518209268210 is a deficient number, since it is larger than the sum of its proper divisors (16741406148326).

20518209268210 is a wasteful number, since it uses less digits than its factorization.

20518209268210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18157707437.

The product of its (nonzero) digits is 276480, while the sum is 46.

The spelling of 20518209268210 in words is "twenty trillion, five hundred eighteen billion, two hundred nine million, two hundred sixty-eight thousand, two hundred ten".