19973718 has 24 divisors (see below), whose sum is σ = 43988256. Its totient is φ = 6548400.

The previous prime is 19973713. The next prime is 19973741. The reversal of 19973718 is 81737991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19973711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7998 + ... + 10193.

It is an arithmetic number, because the mean of its divisors is an integer number (1832844).

Almost surely, 2^19973718 is an apocalyptic number.

19973718 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19973718 is an abundant number, since it is smaller than the sum of its proper divisors (24014538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19973718 is a wasteful number, since it uses less digits than its factorization.

19973718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18260 (or 18257 counting only the distinct ones).

The product of its digits is 95256, while the sum is 45.

The square root of 19973718 is about 4469.1965720921. The cubic root of 19973718 is about 271.3228089994.

The spelling of 19973718 in words is "nineteen million, nine hundred seventy-three thousand, seven hundred eighteen".