20197118 has 4 divisors (see below), whose sum is σ = 30295680. Its totient is φ = 10098558.

The previous prime is 20197109. The next prime is 20197123. The reversal of 20197118 is 81179102.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5049278 + ... + 5049281.

It is an arithmetic number, because the mean of its divisors is an integer number (7573920).

Almost surely, 2^20197118 is an apocalyptic number.

20197118 is a deficient number, since it is larger than the sum of its proper divisors (10098562).

20197118 is a wasteful number, since it uses less digits than its factorization.

20197118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10098561.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 20197118 is about 4494.1203811202. The cubic root of 20197118 is about 272.3306154920.

The spelling of 20197118 in words is "twenty million, one hundred ninety-seven thousand, one hundred eighteen".