20010201001 has 6 divisors (see below), whose sum is σ = 23277172650. Its totient is φ = 17151600816.

The previous prime is 20010200971. The next prime is 20010201019. The reversal of 20010201001 is 10010201002.

It can be written as a sum of positive squares in only one way, i.e., 10224243225 + 9785957776 = 101115^2 + 98924^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20010201001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20010201031) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 204185676 + ... + 204185773.

It is an arithmetic number, because the mean of its divisors is an integer number (3879528775).

Almost surely, 2^20010201001 is an apocalyptic number.

It is an amenable number.

20010201001 is a deficient number, since it is larger than the sum of its proper divisors (3266971649).

20010201001 is an equidigital number, since it uses as much as digits as its factorization.

20010201001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408371463 (or 408371456 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 20010201001 its reverse (10010201002), we get a palindrome (30020402003).

Subtracting from 20010201001 its reverse (10010201002), we obtain a palindrome (9999999999).

The spelling of 20010201001 in words is "twenty billion, ten million, two hundred one thousand, one".