20440533505 has 12 divisors (see below), whose sum is σ = 28533316500. Its totient is φ = 14016365664.

The previous prime is 20440533497. The next prime is 20440533511. The reversal of 20440533505 is 50533504402.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5454856449 + 14985677056 = 73857^2 + 122416^2 .

It is not a de Polignac number, because 20440533505 - 2³ = 20440533497 is a prime.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 41715130 + ... + 41715619.

It is an arithmetic number, because the mean of its divisors is an integer number (2377776375).

Almost surely, 2^20440533505 is an apocalyptic number.

It is an amenable number.

20440533505 is a deficient number, since it is larger than the sum of its proper divisors (8092782995).

20440533505 is an equidigital number, since it uses as much as digits as its factorization.

20440533505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83430768 (or 83430761 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 31.

The spelling of 20440533505 in words is "twenty billion, four hundred forty million, five hundred thirty-three thousand, five hundred five".