20238709 has 4 divisors (see below), whose sum is σ = 20251360. Its totient is φ = 20226060.

The previous prime is 20238703. The next prime is 20238719. The reversal of 20238709 is 90783202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20238709 - 2⁵ = 20238677 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 (20238703) 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, 3507 + ... + 7264.

It is an arithmetic number, because the mean of its divisors is an integer number (5062840).

Almost surely, 2^20238709 is an apocalyptic number.

It is an amenable number.

20238709 is a deficient number, since it is larger than the sum of its proper divisors (12651).

20238709 is a wasteful number, since it uses less digits than its factorization.

20238709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12650.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 20238709 is about 4498.7452695168. The cubic root of 20238709 is about 272.5174199789.

The spelling of 20238709 in words is "twenty million, two hundred thirty-eight thousand, seven hundred nine".