20201111001 has 24 divisors (see below), whose sum is σ = 29976710400. Its totient is φ = 13099621536.

The previous prime is 20201110987. The next prime is 20201111089. The reversal of 20201111001 is 10011110202.

It is a happy number.

It is not a de Polignac number, because 20201111001 - 2¹¹ = 20201108953 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (20201111701) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1559650 + ... + 1572548.

It is an arithmetic number, because the mean of its divisors is an integer number (1249029600).

Almost surely, 2^20201111001 is an apocalyptic number.

It is an amenable number.

20201111001 is a deficient number, since it is larger than the sum of its proper divisors (9775599399).

20201111001 is a wasteful number, since it uses less digits than its factorization.

20201111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17645 (or 17642 counting only the distinct ones).

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

Adding to 20201111001 its reverse (10011110202), we get a palindrome (30212221203).

The spelling of 20201111001 in words is "twenty billion, two hundred one million, one hundred eleven thousand, one".