20615260345 has 4 divisors (see below), whose sum is σ = 24738312420. Its totient is φ = 16492208272.

The previous prime is 20615260343. The next prime is 20615260349. The reversal of 20615260345 is 54306251602.

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 12862281744 + 7752978601 = 113412^2 + 88051^2 .

It is a cyclic number.

It is not a de Polignac number, because 20615260345 - 2¹ = 20615260343 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20615260345.

It is not an unprimeable number, because it can be changed into a prime (20615260343) 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, 2061526030 + ... + 2061526039.

It is an arithmetic number, because the mean of its divisors is an integer number (6184578105).

Almost surely, 2^20615260345 is an apocalyptic number.

It is an amenable number.

20615260345 is a deficient number, since it is larger than the sum of its proper divisors (4123052075).

20615260345 is an equidigital number, since it uses as much as digits as its factorization.

20615260345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4123052074.

The product of its (nonzero) digits is 43200, while the sum is 34.

The spelling of 20615260345 in words is "twenty billion, six hundred fifteen million, two hundred sixty thousand, three hundred forty-five".