20916159245 has 4 divisors (see below), whose sum is σ = 25099391100. Its totient is φ = 16732927392.

The previous prime is 20916159239. The next prime is 20916159293. The reversal of 20916159245 is 54295161902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54295161902 = 2 ⋅27147580951.

It can be written as a sum of positive squares in 2 ways, for example, as 13386952804 + 7529206441 = 115702^2 + 86771^2 .

It is a cyclic number.

It is not a de Polignac number, because 20916159245 - 2⁶ = 20916159181 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20916159196 and 20916159205.

It is a congruent number.

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, 2091615920 + ... + 2091615929.

It is an arithmetic number, because the mean of its divisors is an integer number (6274847775).

Almost surely, 2^20916159245 is an apocalyptic number.

It is an amenable number.

20916159245 is a deficient number, since it is larger than the sum of its proper divisors (4183231855).

20916159245 is an equidigital number, since it uses as much as digits as its factorization.

20916159245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4183231854.

The product of its (nonzero) digits is 194400, while the sum is 44.

The spelling of 20916159245 in words is "twenty billion, nine hundred sixteen million, one hundred fifty-nine thousand, two hundred forty-five".