20231385 has 16 divisors (see below), whose sum is σ = 33060096. Its totient is φ = 10560128.

The previous prime is 20231383. The next prime is 20231389. The reversal of 20231385 is 58313202.

It is a cyclic number.

It is not a de Polignac number, because 20231385 - 2¹ = 20231383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20231383) 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 15 ways as a sum of consecutive naturals, for example, 13644 + ... + 15053.

It is an arithmetic number, because the mean of its divisors is an integer number (2066256).

Almost surely, 2^20231385 is an apocalyptic number.

It is an amenable number.

20231385 is a deficient number, since it is larger than the sum of its proper divisors (12828711).

20231385 is a wasteful number, since it uses less digits than its factorization.

20231385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28752.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20231385 is about 4497.9311911144. The cubic root of 20231385 is about 272.4845430730.

Adding to 20231385 its reverse (58313202), we get a palindrome (78544587).

The spelling of 20231385 in words is "twenty million, two hundred thirty-one thousand, three hundred eighty-five".