20022001001 has 4 divisors (see below), whose sum is σ = 20037392004. Its totient is φ = 20006610000.

The previous prime is 20022000979. The next prime is 20022001007. The reversal of 20022001001 is 10010022002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10010022002 = 2 ⋅5005011001.

It can be written as a sum of positive squares in 2 ways, for example, as 6139506025 + 13882494976 = 78355^2 + 117824^2 .

It is a cyclic number.

It is not a de Polignac number, because 20022001001 - 2¹⁸ = 20021738857 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 20022001001.

It is not an unprimeable number, because it can be changed into a prime (20022001007) 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, 7693550 + ... + 7696151.

It is an arithmetic number, because the mean of its divisors is an integer number (5009348001).

Almost surely, 2^20022001001 is an apocalyptic number.

It is an amenable number.

20022001001 is a deficient number, since it is larger than the sum of its proper divisors (15391003).

20022001001 is a wasteful number, since it uses less digits than its factorization.

20022001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15391002.

The product of its (nonzero) digits is 8, while the sum is 8.

Adding to 20022001001 its reverse (10010022002), we get a palindrome (30032023003).

The spelling of 20022001001 in words is "twenty billion, twenty-two million, one thousand, one".