19691946 has 12 divisors (see below), whose sum is σ = 42665922. Its totient is φ = 6563976.

The previous prime is 19691941. The next prime is 19691951. The reversal of 19691946 is 64919691.

It is an interprime number because it is at equal distance from previous prime (19691941) and next prime (19691951).

It can be written as a sum of positive squares in only one way, i.e., 16040025 + 3651921 = 4005^2 + 1911^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19691941) 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 5 ways as a sum of consecutive naturals, for example, 546981 + ... + 547016.

Almost surely, 2^19691946 is an apocalyptic number.

19691946 is an abundant number, since it is smaller than the sum of its proper divisors (22973976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19691946 is a wasteful number, since it uses less digits than its factorization.

19691946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094005 (or 1094002 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 19691946 is about 4437.5608164847. The cubic root of 19691946 is about 270.0408991541.

The spelling of 19691946 in words is "nineteen million, six hundred ninety-one thousand, nine hundred forty-six".