20111001204 has 72 divisors (see below), whose sum is σ = 54643669248. Its totient is φ = 5740035840.

The previous prime is 20111001203. The next prime is 20111001227. The reversal of 20111001204 is 40210011102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 20111001204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111001203) 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, 565452 + ... + 599964.

Almost surely, 2^20111001204 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20111001204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27321834624).

20111001204 is an abundant number, since it is smaller than the sum of its proper divisors (34532668044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20111001204 is a wasteful number, since it uses less digits than its factorization.

20111001204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35525 (or 35516 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20111001204 its reverse (40210011102), we get a palindrome (60321012306).

The spelling of 20111001204 in words is "twenty billion, one hundred eleven million, one thousand, two hundred four".