220636693 has 4 divisors (see below), whose sum is σ = 233615340. Its totient is φ = 207658048.

The previous prime is 220636679. The next prime is 220636697. The reversal of 220636693 is 396636022.

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 205721649 + 14915044 = 14343^2 + 3862^2 .

It is a cyclic number.

It is not a de Polignac number, because 220636693 - 2¹³ = 220628501 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 (220636697) 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, 6489298 + ... + 6489331.

It is an arithmetic number, because the mean of its divisors is an integer number (58403835).

Almost surely, 2^220636693 is an apocalyptic number.

It is an amenable number.

220636693 is a deficient number, since it is larger than the sum of its proper divisors (12978647).

220636693 is a wasteful number, since it uses less digits than its factorization.

220636693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12978646.

The product of its (nonzero) digits is 69984, while the sum is 37.

The square root of 220636693 is about 14853.8443845356. The cubic root of 220636693 is about 604.2628756835.

The spelling of 220636693 in words is "two hundred twenty million, six hundred thirty-six thousand, six hundred ninety-three".