19668953 has 4 divisors (see below), whose sum is σ = 19812660. Its totient is φ = 19525248.

The previous prime is 19668937. The next prime is 19668959. The reversal of 19668953 is 35986691.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6615184 + 13053769 = 2572^2 + 3613^2 .

It is a cyclic number.

It is not a de Polignac number, because 19668953 - 2⁴ = 19668937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19668898 and 19668907.

It is not an unprimeable number, because it can be changed into a prime (19668959) 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, 71648 + ... + 71921.

It is an arithmetic number, because the mean of its divisors is an integer number (4953165).

Almost surely, 2^19668953 is an apocalyptic number.

It is an amenable number.

19668953 is a deficient number, since it is larger than the sum of its proper divisors (143707).

19668953 is a wasteful number, since it uses less digits than its factorization.

19668953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143706.

The product of its digits is 349920, while the sum is 47.

The square root of 19668953 is about 4434.9693347305. The cubic root of 19668953 is about 269.9357551764.

The spelling of 19668953 in words is "nineteen million, six hundred sixty-eight thousand, nine hundred fifty-three".