20200111001001 has 12 divisors (see below), whose sum is σ = 29966531035012. Its totient is φ = 13102774703136.

The previous prime is 20200111000999. The next prime is 20200111001009. The reversal of 20200111001001 is 10010011100202.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6835610250000 + 13364500751001 = 2614500^2 + 3655749^2 .

It is not a de Polignac number, because 20200111001001 - 2¹ = 20200111000999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20200111001009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30330496666 + ... + 30330497331.

Almost surely, 2^{20200111001001} is an apocalyptic number.

It is an amenable number.

20200111001001 is a deficient number, since it is larger than the sum of its proper divisors (9766420034011).

20200111001001 is a wasteful number, since it uses less digits than its factorization.

20200111001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60660994040 (or 60660994037 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 20200111001001 its reverse (10010011100202), we get a palindrome (30210122101203).

The spelling of 20200111001001 in words is "twenty trillion, two hundred billion, one hundred eleven million, one thousand, one".