20709393 has 8 divisors (see below), whose sum is σ = 28564800. Its totient is φ = 13330128.

The previous prime is 20709391. The next prime is 20709401. The reversal of 20709393 is 39390702.

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

It is not a de Polignac number, because 20709393 - 2¹ = 20709391 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20709391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118933 + ... + 119106.

It is an arithmetic number, because the mean of its divisors is an integer number (3570600).

Almost surely, 2^20709393 is an apocalyptic number.

It is an amenable number.

20709393 is a deficient number, since it is larger than the sum of its proper divisors (7855407).

20709393 is a wasteful number, since it uses less digits than its factorization.

20709393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238071.

The product of its (nonzero) digits is 10206, while the sum is 33.

The square root of 20709393 is about 4550.7574094869. The cubic root of 20709393 is about 274.6138624717.

The spelling of 20709393 in words is "twenty million, seven hundred nine thousand, three hundred ninety-three".