20001323111 has 24 divisors (see below), whose sum is σ = 25158003360. Its totient is φ = 15565366080.

The previous prime is 20001323053. The next prime is 20001323119. The reversal of 20001323111 is 11132310002.

It is not a de Polignac number, because 20001323111 - 2¹⁰ = 20001322087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001323119) 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, 660245 + ... + 689873.

It is an arithmetic number, because the mean of its divisors is an integer number (1048250140).

Almost surely, 2^20001323111 is an apocalyptic number.

20001323111 is a deficient number, since it is larger than the sum of its proper divisors (5156680249).

20001323111 is a wasteful number, since it uses less digits than its factorization.

20001323111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30455 (or 30444 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 20001323111 its reverse (11132310002), we get a palindrome (31133633113).

The spelling of 20001323111 in words is "twenty billion, one million, three hundred twenty-three thousand, one hundred eleven".