20019968549 has 8 divisors (see below), whose sum is σ = 22880843328. Its totient is φ = 17159313600.

The previous prime is 20019968537. The next prime is 20019968623. The reversal of 20019968549 is 94586991002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20019968549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20019968549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20019962549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262349 + ... + 329949.

It is an arithmetic number, because the mean of its divisors is an integer number (2860105416).

Almost surely, 2^20019968549 is an apocalyptic number.

It is an amenable number.

20019968549 is a deficient number, since it is larger than the sum of its proper divisors (2860874779).

20019968549 is an equidigital number, since it uses as much as digits as its factorization.

20019968549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109915.

The product of its (nonzero) digits is 1399680, while the sum is 53.

The spelling of 20019968549 in words is "twenty billion, nineteen million, nine hundred sixty-eight thousand, five hundred forty-nine".