20405642440333 has 4 divisors (see below), whose sum is σ = 20414015705980. Its totient is φ = 20397269174688.

The previous prime is 20405642440307. The next prime is 20405642440361. The reversal of 20405642440333 is 33304424650402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18889993372644 + 1515649067689 = 4346262^2 + 1231117^2 .

It is a cyclic number.

It is not a de Polignac number, because 20405642440333 - 2⁹ = 20405642439821 is a prime.

It is a super-2 number, since 2×20405642440333² (a number of 27 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 (20405642440433) 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, 4186629168 + ... + 4186634041.

It is an arithmetic number, because the mean of its divisors is an integer number (5103503926495).

Almost surely, 2^{20405642440333} is an apocalyptic number.

It is an amenable number.

20405642440333 is a deficient number, since it is larger than the sum of its proper divisors (8373265647).

20405642440333 is an equidigital number, since it uses as much as digits as its factorization.

20405642440333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8373265646.

The product of its (nonzero) digits is 829440, while the sum is 40.

The spelling of 20405642440333 in words is "twenty trillion, four hundred five billion, six hundred forty-two million, four hundred forty thousand, three hundred thirty-three".