20749493361 has 8 divisors (see below), whose sum is σ = 29293402464. Its totient is φ = 13019289920.

The previous prime is 20749493353. The next prime is 20749493363. The reversal of 20749493361 is 16339494702.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20749493361 - 2³ = 20749493353 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20749493361.

It is not an unprimeable number, because it can be changed into a prime (20749493363) 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, 203426355 + ... + 203426456.

It is an arithmetic number, because the mean of its divisors is an integer number (3661675308).

Almost surely, 2^20749493361 is an apocalyptic number.

It is an amenable number.

20749493361 is a deficient number, since it is larger than the sum of its proper divisors (8543909103).

20749493361 is a wasteful number, since it uses less digits than its factorization.

20749493361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406852831.

The product of its (nonzero) digits is 979776, while the sum is 48.

The spelling of 20749493361 in words is "twenty billion, seven hundred forty-nine million, four hundred ninety-three thousand, three hundred sixty-one".