20502018499 has 4 divisors (see below), whose sum is σ = 20528541936. Its totient is φ = 20475495064.

The previous prime is 20502018497. The next prime is 20502018521. The reversal of 20502018499 is 99481020502.

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 20502018499 - 2¹ = 20502018497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20502018497) 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, 13260559 + ... + 13262104.

It is an arithmetic number, because the mean of its divisors is an integer number (5132135484).

Almost surely, 2^20502018499 is an apocalyptic number.

20502018499 is a deficient number, since it is larger than the sum of its proper divisors (26523437).

20502018499 is an equidigital number, since it uses as much as digits as its factorization.

20502018499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26523436.

The product of its (nonzero) digits is 51840, while the sum is 40.

The spelling of 20502018499 in words is "twenty billion, five hundred two million, eighteen thousand, four hundred ninety-nine".