20326559569 has 4 divisors (see below), whose sum is σ = 20335411044. Its totient is φ = 20317708096.

The previous prime is 20326559543. The next prime is 20326559573. The reversal of 20326559569 is 96595562302.

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: 96595562302 = 2 ⋅48297781151.

It can be written as a sum of positive squares in 2 ways, for example, as 11275891344 + 9050668225 = 106188^2 + 95135^2 .

It is a cyclic number.

It is not a de Polignac number, because 20326559569 - 2¹⁹ = 20326035281 is a prime.

It is a super-2 number, since 2×20326559569² (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 (20326559599) 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, 4422292 + ... + 4426885.

It is an arithmetic number, because the mean of its divisors is an integer number (5083852761).

Almost surely, 2^20326559569 is an apocalyptic number.

It is an amenable number.

20326559569 is a deficient number, since it is larger than the sum of its proper divisors (8851475).

20326559569 is an equidigital number, since it uses as much as digits as its factorization.

20326559569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8851474.

The product of its (nonzero) digits is 4374000, while the sum is 52.

The spelling of 20326559569 in words is "twenty billion, three hundred twenty-six million, five hundred fifty-nine thousand, five hundred sixty-nine".