20693309 has 8 divisors (see below), whose sum is σ = 25468800. Its totient is φ = 16372656.

The previous prime is 20693303. The next prime is 20693329. The reversal of 20693309 is 90339602.

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 20693309 - 2⁸ = 20693053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20693303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113609 + ... + 113790.

It is an arithmetic number, because the mean of its divisors is an integer number (3183600).

Almost surely, 2^20693309 is an apocalyptic number.

It is an amenable number.

20693309 is a deficient number, since it is larger than the sum of its proper divisors (4775491).

20693309 is a wasteful number, since it uses less digits than its factorization.

20693309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227419.

The product of its (nonzero) digits is 8748, while the sum is 32.

The square root of 20693309 is about 4548.9898878762. The cubic root of 20693309 is about 274.5427508861.

The spelling of 20693309 in words is "twenty million, six hundred ninety-three thousand, three hundred nine".