19995764 has 6 divisors (see below), whose sum is σ = 34992594. Its totient is φ = 9997880.

The previous prime is 19995721. The next prime is 19995797. The reversal of 19995764 is 46759991.

It can be written as a sum of positive squares in only one way, i.e., 14668900 + 5326864 = 3830^2 + 2308^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2499467 + ... + 2499474.

It is an arithmetic number, because the mean of its divisors is an integer number (5832099).

Almost surely, 2^19995764 is an apocalyptic number.

It is an amenable number.

19995764 is a deficient number, since it is larger than the sum of its proper divisors (14996830).

19995764 is a wasteful number, since it uses less digits than its factorization.

19995764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4998945 (or 4998943 counting only the distinct ones).

The product of its digits is 612360, while the sum is 50.

The square root of 19995764 is about 4471.6623307222. The cubic root of 19995764 is about 271.4225965180.

The spelling of 19995764 in words is "nineteen million, nine hundred ninety-five thousand, seven hundred sixty-four".