20001220020001 has 16 divisors (see below), whose sum is σ = 22577181399360. Its totient is φ = 17551829619520.

The previous prime is 20001220019999. The next prime is 20001220020011. The reversal of 20001220020001 is 10002002210002.

It is a cyclic number.

It is not a de Polignac number, because 20001220020001 - 2¹ = 20001220019999 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20001220020001.

It is not an unprimeable number, because it can be changed into a prime (20001220020011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5953330 + ... + 8685883.

It is an arithmetic number, because the mean of its divisors is an integer number (1411073837460).

Almost surely, 2^{20001220020001} is an apocalyptic number.

It is an amenable number.

20001220020001 is a deficient number, since it is larger than the sum of its proper divisors (2575961379359).

20001220020001 is a wasteful number, since it uses less digits than its factorization.

20001220020001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14643536.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20001220020001 its reverse (10002002210002), we get a palindrome (30003222230003).

The spelling of 20001220020001 in words is "twenty trillion, one billion, two hundred twenty million, twenty thousand, one".