19957118 has 8 divisors (see below), whose sum is σ = 30901440. Its totient is φ = 9656640.

The previous prime is 19957111. The next prime is 19957127. The reversal of 19957118 is 81175991.

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 (19957111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160883 + ... + 161006.

It is an arithmetic number, because the mean of its divisors is an integer number (3862680).

Almost surely, 2^19957118 is an apocalyptic number.

19957118 is a deficient number, since it is larger than the sum of its proper divisors (10944322).

19957118 is a wasteful number, since it uses less digits than its factorization.

19957118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321922.

The product of its digits is 22680, while the sum is 41.

The square root of 19957118 is about 4467.3390289970. The cubic root of 19957118 is about 271.2476234156.

The spelling of 19957118 in words is "nineteen million, nine hundred fifty-seven thousand, one hundred eighteen".