20493518 has 8 divisors (see below), whose sum is σ = 30764448. Its totient is φ = 10238704.

The previous prime is 20493503. The next prime is 20493521. The reversal of 20493518 is 81539402.

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

It is a congruent number.

It is an unprimeable number.

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, 71 + ... + 6402.

It is an arithmetic number, because the mean of its divisors is an integer number (3845556).

Almost surely, 2^20493518 is an apocalyptic number.

20493518 is a deficient number, since it is larger than the sum of its proper divisors (10270930).

20493518 is a wasteful number, since it uses less digits than its factorization.

20493518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8058.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 20493518 is about 4526.9766953233. The cubic root of 20493518 is about 273.6563347257.

The spelling of 20493518 in words is "twenty million, four hundred ninety-three thousand, five hundred eighteen".