19966955 has 8 divisors (see below), whose sum is σ = 24412752. Its totient is φ = 15671968.

The previous prime is 19966951. The next prime is 19967047. The reversal of 19966955 is 55966991.

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

It is a cyclic number.

It is not a de Polignac number, because 19966955 - 2² = 19966951 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19966951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37409 + ... + 37938.

It is an arithmetic number, because the mean of its divisors is an integer number (3051594).

Almost surely, 2^19966955 is an apocalyptic number.

19966955 is a deficient number, since it is larger than the sum of its proper divisors (4445797).

19966955 is an equidigital number, since it uses as much as digits as its factorization.

19966955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75405.

The product of its digits is 656100, while the sum is 50.

The square root of 19966955 is about 4468.4398843444. The cubic root of 19966955 is about 271.2921826984.

The spelling of 19966955 in words is "nineteen million, nine hundred sixty-six thousand, nine hundred fifty-five".