20000001001 has 4 divisors (see below), whose sum is σ = 20194175872. Its totient is φ = 19805826132.

The previous prime is 20000000927. The next prime is 20000001017. The reversal of 20000001001 is 10010000002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10010000002 = 2 ⋅5005000001.

It is a cyclic number.

It is not a de Polignac number, because 20000001001 - 2⁷ = 20000000873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20000001031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97087281 + ... + 97087486.

It is an arithmetic number, because the mean of its divisors is an integer number (5048543968).

Almost surely, 2^20000001001 is an apocalyptic number.

It is an amenable number.

20000001001 is a deficient number, since it is larger than the sum of its proper divisors (194174871).

20000001001 is a wasteful number, since it uses less digits than its factorization.

20000001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194174870.

The product of its (nonzero) digits is 2, while the sum is 4.

Adding to 20000001001 its reverse (10010000002), we get a palindrome (30010001003).

Subtracting from 20000001001 its reverse (10010000002), we obtain a palindrome (9990000999).

The spelling of 20000001001 in words is "twenty billion, one thousand, one".