20440021133 has 16 divisors (see below), whose sum is σ = 24432316416. Its totient is φ = 16719339120.

The previous prime is 20440021123. The next prime is 20440021157. The reversal of 20440021133 is 33112004402.

It is a cyclic number.

It is not a de Polignac number, because 20440021133 - 2⁴ = 20440021117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20440021123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77891 + ... + 216672.

It is an arithmetic number, because the mean of its divisors is an integer number (1527019776).

Almost surely, 2^20440021133 is an apocalyptic number.

20440021133 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20440021133 is a deficient number, since it is larger than the sum of its proper divisors (3992295283).

20440021133 is a wasteful number, since it uses less digits than its factorization.

20440021133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295024.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20440021133 its reverse (33112004402), we get a palindrome (53552025535).

The spelling of 20440021133 in words is "twenty billion, four hundred forty million, twenty-one thousand, one hundred thirty-three".