20852698145 has 4 divisors (see below), whose sum is σ = 25023237780. Its totient is φ = 16682158512.

The previous prime is 20852698109. The next prime is 20852698193. The reversal of 20852698145 is 54189625802.

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 2178929041 + 18673769104 = 46679^2 + 136652^2 .

It is a cyclic number.

It is not a de Polignac number, because 20852698145 - 2¹⁰ = 20852697121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20852698093 and 20852698102.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2085269810 + ... + 2085269819.

It is an arithmetic number, because the mean of its divisors is an integer number (6255809445).

Almost surely, 2^20852698145 is an apocalyptic number.

It is an amenable number.

20852698145 is a deficient number, since it is larger than the sum of its proper divisors (4170539635).

20852698145 is an equidigital number, since it uses as much as digits as its factorization.

20852698145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4170539634.

The product of its (nonzero) digits is 1382400, while the sum is 50.

The spelling of 20852698145 in words is "twenty billion, eight hundred fifty-two million, six hundred ninety-eight thousand, one hundred forty-five".