20843693 has 4 divisors (see below), whose sum is σ = 22447068. Its totient is φ = 19240320.

The previous prime is 20843689. The next prime is 20843723. The reversal of 20843693 is 39634802.

It is a happy number.

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 13564489 + 7279204 = 3683^2 + 2698^2 .

It is a cyclic number.

It is not a de Polignac number, because 20843693 - 2² = 20843689 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 (20843623) 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, 801668 + ... + 801693.

It is an arithmetic number, because the mean of its divisors is an integer number (5611767).

Almost surely, 2^20843693 is an apocalyptic number.

It is an amenable number.

20843693 is a deficient number, since it is larger than the sum of its proper divisors (1603375).

20843693 is a wasteful number, since it uses less digits than its factorization.

20843693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1603374.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 20843693 is about 4565.4893494564. The cubic root of 20843693 is about 275.2062056709.

The spelling of 20843693 in words is "twenty million, eight hundred forty-three thousand, six hundred ninety-three".