19997148 has 12 divisors (see below), whose sum is σ = 46660040. Its totient is φ = 6665712.

The previous prime is 19997147. The next prime is 19997149. The reversal of 19997148 is 84179991.

It is an interprime number because it is at equal distance from previous prime (19997147) and next prime (19997149).

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 19997097 and 19997106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19997147) 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 3 ways as a sum of consecutive naturals, for example, 833203 + ... + 833226.

Almost surely, 2^19997148 is an apocalyptic number.

It is an amenable number.

19997148 is an abundant number, since it is smaller than the sum of its proper divisors (26662892).

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

19997148 is a wasteful number, since it uses less digits than its factorization.

19997148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666436 (or 1666434 counting only the distinct ones).

The product of its digits is 163296, while the sum is 48.

The square root of 19997148 is about 4471.8170803377. The cubic root of 19997148 is about 271.4288585144.

The spelling of 19997148 in words is "nineteen million, nine hundred ninety-seven thousand, one hundred forty-eight".