19776946 has 16 divisors (see below), whose sum is σ = 34997760. Its totient is φ = 8202240.

The previous prime is 19776937. The next prime is 19776949. The reversal of 19776946 is 64967791.

It is a super-2 number, since 2×19776946² = 782255186173832, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19776946.

It is not an unprimeable number, because it can be changed into a prime (19776949) 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 7 ways as a sum of consecutive naturals, for example, 22351 + ... + 23218.

It is an arithmetic number, because the mean of its divisors is an integer number (2187360).

Almost surely, 2^19776946 is an apocalyptic number.

19776946 is a deficient number, since it is larger than the sum of its proper divisors (15220814).

19776946 is a wasteful number, since it uses less digits than its factorization.

19776946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45609.

The product of its digits is 571536, while the sum is 49.

The square root of 19776946 is about 4447.1278371551. The cubic root of 19776946 is about 270.4288839895.

The spelling of 19776946 in words is "nineteen million, seven hundred seventy-six thousand, nine hundred forty-six".