20228603438765 has 4 divisors (see below), whose sum is σ = 24274324126524. Its totient is φ = 16182882751008.

The previous prime is 20228603438711. The next prime is 20228603438767. The reversal of 20228603438765 is 56783430682202.

It is a happy number.

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 12309410859529 + 7919192579236 = 3508477^2 + 2814106^2 .

It is a cyclic number.

It is not a de Polignac number, because 20228603438765 - 2⁸ = 20228603438509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20228603438765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20228603438767) 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, 2022860343872 + ... + 2022860343881.

It is an arithmetic number, because the mean of its divisors is an integer number (6068581031631).

Almost surely, 2^{20228603438765} is an apocalyptic number.

It is an amenable number.

20228603438765 is a deficient number, since it is larger than the sum of its proper divisors (4045720687759).

20228603438765 is an equidigital number, since it uses as much as digits as its factorization.

20228603438765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4045720687758.

The product of its (nonzero) digits is 23224320, while the sum is 56.

The spelling of 20228603438765 in words is "twenty trillion, two hundred twenty-eight billion, six hundred three million, four hundred thirty-eight thousand, seven hundred sixty-five".