19965542 has 8 divisors (see below), whose sum is σ = 31524600. Its totient is φ = 9457344.

The previous prime is 19965521. The next prime is 19965551. The reversal of 19965542 is 24556991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 19965542.

It is a congruent number.

It is an unprimeable number.

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, 262667 + ... + 262742.

It is an arithmetic number, because the mean of its divisors is an integer number (3940575).

Almost surely, 2^19965542 is an apocalyptic number.

19965542 is a deficient number, since it is larger than the sum of its proper divisors (11559058).

19965542 is a wasteful number, since it uses less digits than its factorization.

19965542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525430.

The product of its digits is 97200, while the sum is 41.

The square root of 19965542 is about 4468.2817726728. The cubic root of 19965542 is about 271.2857830429.

The spelling of 19965542 in words is "nineteen million, nine hundred sixty-five thousand, five hundred forty-two".