20360209979 has 4 divisors (see below), whose sum is σ = 20793405984. Its totient is φ = 19927013976.

The previous prime is 20360209949. The next prime is 20360209993. The reversal of 20360209979 is 97990206302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20360209979 - 2¹² = 20360205883 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 433195957 = 20360209979 / (2 + 0 + 3 + 6 + 0 + 2 + 0 + 9 + 9 + 7 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20360209949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216597932 + ... + 216598025.

It is an arithmetic number, because the mean of its divisors is an integer number (5198351496).

Almost surely, 2^20360209979 is an apocalyptic number.

20360209979 is a deficient number, since it is larger than the sum of its proper divisors (433196005).

20360209979 is an equidigital number, since it uses as much as digits as its factorization.

20360209979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433196004.

The product of its (nonzero) digits is 367416, while the sum is 47.

The spelling of 20360209979 in words is "twenty billion, three hundred sixty million, two hundred nine thousand, nine hundred seventy-nine".