20693633 has 4 divisors (see below), whose sum is σ = 20747220. Its totient is φ = 20640048.

The previous prime is 20693609. The next prime is 20693639. The reversal of 20693633 is 33639602.

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 9591409 + 11102224 = 3097^2 + 3332^2 .

It is a cyclic number.

It is not a de Polignac number, because 20693633 - 2²⁰ = 19645057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20693633.

It is not an unprimeable number, because it can be changed into a prime (20693639) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 26210 + ... + 26987.

It is an arithmetic number, because the mean of its divisors is an integer number (5186805).

Almost surely, 2^20693633 is an apocalyptic number.

It is an amenable number.

20693633 is a deficient number, since it is larger than the sum of its proper divisors (53587).

20693633 is an equidigital number, since it uses as much as digits as its factorization.

20693633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53586.

The product of its (nonzero) digits is 17496, while the sum is 32.

The square root of 20693633 is about 4549.0255000384. The cubic root of 20693633 is about 274.5441837387.

It can be divided in two parts, 206 and 93633, that added together give a palindrome (93839).

The spelling of 20693633 in words is "twenty million, six hundred ninety-three thousand, six hundred thirty-three".