20609371 has 4 divisors (see below), whose sum is σ = 20669112. Its totient is φ = 20549632.

The previous prime is 20609293. The next prime is 20609387. The reversal of 20609371 is 17390602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17390602 = 2 ⋅8695301.

It is a cyclic number.

It is not a de Polignac number, because 20609371 - 2¹³ = 20601179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20606371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29350 + ... + 30043.

It is an arithmetic number, because the mean of its divisors is an integer number (5167278).

Almost surely, 2^20609371 is an apocalyptic number.

20609371 is a deficient number, since it is larger than the sum of its proper divisors (59741).

20609371 is an equidigital number, since it uses as much as digits as its factorization.

20609371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59740.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 20609371 is about 4539.7545087813. The cubic root of 20609371 is about 274.1710397806.

Adding to 20609371 its reverse (17390602), we get a palindrome (37999973).

The spelling of 20609371 in words is "twenty million, six hundred nine thousand, three hundred seventy-one".