20507471721826 has 16 divisors (see below), whose sum is σ = 31198726126584. Its totient is φ = 10108041681024.

The previous prime is 20507471721811. The next prime is 20507471721833. The reversal of 20507471721826 is 62812717470502.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20101637745225 + 405833976601 = 4483485^2 + 637051^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 36050461 + ... + 36614896.

Almost surely, 2^{20507471721826} is an apocalyptic number.

20507471721826 is a deficient number, since it is larger than the sum of its proper divisors (10691254404758).

20507471721826 is a wasteful number, since it uses less digits than its factorization.

20507471721826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72667365.

The product of its (nonzero) digits is 2634240, while the sum is 52.

The spelling of 20507471721826 in words is "twenty trillion, five hundred seven billion, four hundred seventy-one million, seven hundred twenty-one thousand, eight hundred twenty-six".