20001243433 has 4 divisors (see below), whose sum is σ = 20012867028. Its totient is φ = 19989619840.

The previous prime is 20001243391. The next prime is 20001243473. The reversal of 20001243433 is 33434210002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33434210002 = 2 ⋅16717105001.

It can be written as a sum of positive squares in 2 ways, for example, as 15969882384 + 4031361049 = 126372^2 + 63493^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20001243433 is a prime.

It is a super-2 number, since 2×20001243433² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001243473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5809216 + ... + 5812657.

It is an arithmetic number, because the mean of its divisors is an integer number (5003216757).

Almost surely, 2^20001243433 is an apocalyptic number.

It is an amenable number.

20001243433 is a deficient number, since it is larger than the sum of its proper divisors (11623595).

20001243433 is a wasteful number, since it uses less digits than its factorization.

20001243433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11623594.

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 20001243433 its reverse (33434210002), we get a palindrome (53435453435).

The spelling of 20001243433 in words is "twenty billion, one million, two hundred forty-three thousand, four hundred thirty-three".