19965963 has 4 divisors (see below), whose sum is σ = 26621288. Its totient is φ = 13310640.

The previous prime is 19965961. The next prime is 19965997. The reversal of 19965963 is 36956991.

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

It is not a de Polignac number, because 19965963 - 2¹ = 19965961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19965961) 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, 3327658 + ... + 3327663.

It is an arithmetic number, because the mean of its divisors is an integer number (6655322).

Almost surely, 2^19965963 is an apocalyptic number.

19965963 is a deficient number, since it is larger than the sum of its proper divisors (6655325).

19965963 is an equidigital number, since it uses as much as digits as its factorization.

19965963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6655324.

The product of its digits is 393660, while the sum is 48.

The square root of 19965963 is about 4468.3288822556. The cubic root of 19965963 is about 271.2876898367.

The spelling of 19965963 in words is "nineteen million, nine hundred sixty-five thousand, nine hundred sixty-three".