20493718 has 8 divisors (see below), whose sum is σ = 35132112. Its totient is φ = 8783016.

The previous prime is 20493679. The next prime is 20493719. The reversal of 20493718 is 81739402.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20493719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 731905 + ... + 731932.

It is an arithmetic number, because the mean of its divisors is an integer number (4391514).

Almost surely, 2^20493718 is an apocalyptic number.

20493718 is a deficient number, since it is larger than the sum of its proper divisors (14638394).

20493718 is a wasteful number, since it uses less digits than its factorization.

20493718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463846.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 20493718 is about 4526.9987850672. The cubic root of 20493718 is about 273.6572249436.

The spelling of 20493718 in words is "twenty million, four hundred ninety-three thousand, seven hundred eighteen".