20602985017919 has 4 divisors (see below), whose sum is σ = 20619749042760. Its totient is φ = 20586220993080.

The previous prime is 20602985017889. The next prime is 20602985017991. The reversal of 20602985017919 is 91971058920602.

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 20602985017919 - 2²⁸ = 20602716582463 is a prime.

It is a super-2 number, since 2×20602985017919² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20602985017019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8382010577 + ... + 8382013034.

It is an arithmetic number, because the mean of its divisors is an integer number (5154937260690).

Almost surely, 2^{20602985017919} is an apocalyptic number.

20602985017919 is a deficient number, since it is larger than the sum of its proper divisors (16764024841).

20602985017919 is a wasteful number, since it uses less digits than its factorization.

20602985017919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16764024840.

The product of its (nonzero) digits is 4898880, while the sum is 59.

The spelling of 20602985017919 in words is "twenty trillion, six hundred two billion, nine hundred eighty-five million, seventeen thousand, nine hundred nineteen".