20423444440033 has 4 divisors (see below), whose sum is σ = 20423564370180. Its totient is φ = 20423324509888.

The previous prime is 20423444440013. The next prime is 20423444440057. The reversal of 20423444440033 is 33004444432402.

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 12610396436544 + 7813048003489 = 3551112^2 + 2795183^2 .

It is a cyclic number.

It is not a de Polignac number, because 20423444440033 - 2⁹ = 20423444439521 is a prime.

It is a super-2 number, since 2×20423444440033² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20423444439974 and 20423444440001.

It is not an unprimeable number, because it can be changed into a prime (20423444440013) 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, 59709268 + ... + 60050341.

It is an arithmetic number, because the mean of its divisors is an integer number (5105891092545).

Almost surely, 2^{20423444440033} is an apocalyptic number.

It is an amenable number.

20423444440033 is a deficient number, since it is larger than the sum of its proper divisors (119930147).

20423444440033 is a wasteful number, since it uses less digits than its factorization.

20423444440033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119930146.

The product of its (nonzero) digits is 442368, while the sum is 37.

Adding to 20423444440033 its reverse (33004444432402), we get a palindrome (53427888872435).

The spelling of 20423444440033 in words is "twenty trillion, four hundred twenty-three billion, four hundred forty-four million, four hundred forty thousand, thirty-three".