20001020001 has 32 divisors (see below), whose sum is σ = 27633709440. Its totient is φ = 12862080000.

The previous prime is 20001019993. The next prime is 20001020003. The reversal of 20001020001 is 10002010002.

It is a happy number.

It is not a de Polignac number, because 20001020001 - 2³ = 20001019993 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20001020003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2015151 + ... + 2025051.

It is an arithmetic number, because the mean of its divisors is an integer number (863553420).

Almost surely, 2^20001020001 is an apocalyptic number.

It is an amenable number.

20001020001 is a deficient number, since it is larger than the sum of its proper divisors (7632689439).

20001020001 is a wasteful number, since it uses less digits than its factorization.

20001020001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10177.

The product of its (nonzero) digits is 4, while the sum is 6.

Adding to 20001020001 its reverse (10002010002), we get a palindrome (30003030003).

Subtracting from 20001020001 its reverse (10002010002), we obtain a palindrome (9999009999).

The spelling of 20001020001 in words is "twenty billion, one million, twenty thousand, one".