19946965 has 4 divisors (see below), whose sum is σ = 23936364. Its totient is φ = 15957568.

The previous prime is 19946963. The next prime is 19946989. The reversal of 19946965 is 56964991.

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 14311089 + 5635876 = 3783^2 + 2374^2 .

It is a cyclic number.

It is not a de Polignac number, because 19946965 - 2¹ = 19946963 is a prime.

It is a super-2 number, since 2×19946965² = 795762825422450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19946963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1994692 + ... + 1994701.

It is an arithmetic number, because the mean of its divisors is an integer number (5984091).

Almost surely, 2^19946965 is an apocalyptic number.

It is an amenable number.

19946965 is a deficient number, since it is larger than the sum of its proper divisors (3989399).

19946965 is an equidigital number, since it uses as much as digits as its factorization.

19946965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3989398.

The product of its digits is 524880, while the sum is 49.

The square root of 19946965 is about 4466.2025256363. The cubic root of 19946965 is about 271.2016173695.

The spelling of 19946965 in words is "nineteen million, nine hundred forty-six thousand, nine hundred sixty-five".