19795661 has 8 divisors (see below), whose sum is σ = 20979000. Its totient is φ = 18645760.

The previous prime is 19795651. The next prime is 19795681. The reversal of 19795661 is 16659791.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1357225 + 18438436 = 1165^2 + 4294^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19795661 - 2⁶ = 19795597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19795631) 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, 7136 + ... + 9513.

It is an arithmetic number, because the mean of its divisors is an integer number (2622375).

Almost surely, 2^19795661 is an apocalyptic number.

It is an amenable number.

19795661 is a deficient number, since it is larger than the sum of its proper divisors (1183339).

19795661 is a wasteful number, since it uses less digits than its factorization.

19795661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16719.

The product of its digits is 102060, while the sum is 44.

The square root of 19795661 is about 4449.2315066762. The cubic root of 19795661 is about 270.5141597270.

The spelling of 19795661 in words is "nineteen million, seven hundred ninety-five thousand, six hundred sixty-one".