20201100181 has 4 divisors (see below), whose sum is σ = 21264316000. Its totient is φ = 19137884364.

The previous prime is 20201100151. The next prime is 20201100223. The reversal of 20201100181 is 18100110202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20201100181 - 2¹¹ = 20201098133 is a prime.

It is a super-2 number, since 2×20201100181² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201100151) 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, 531607881 + ... + 531607918.

It is an arithmetic number, because the mean of its divisors is an integer number (5316079000).

Almost surely, 2^20201100181 is an apocalyptic number.

It is an amenable number.

20201100181 is a deficient number, since it is larger than the sum of its proper divisors (1063215819).

20201100181 is a wasteful number, since it uses less digits than its factorization.

20201100181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063215818.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20201100181 its reverse (18100110202), we get a palindrome (38301210383).

The spelling of 20201100181 in words is "twenty billion, two hundred one million, one hundred thousand, one hundred eighty-one".