20391418 has 8 divisors (see below), whose sum is σ = 30873312. Its totient is φ = 10100316.

The previous prime is 20391407. The next prime is 20391421. The reversal of 20391418 is 81419302.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47430 + ... + 47857.

It is an arithmetic number, because the mean of its divisors is an integer number (3859164).

Almost surely, 2^20391418 is an apocalyptic number.

20391418 is a deficient number, since it is larger than the sum of its proper divisors (10481894).

20391418 is a wasteful number, since it uses less digits than its factorization.

20391418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95396.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 20391418 is about 4515.6857729474. The cubic root of 20391418 is about 273.2011202076.

The spelling of 20391418 in words is "twenty million, three hundred ninety-one thousand, four hundred eighteen".