20230391 has 4 divisors (see below), whose sum is σ = 21420432. Its totient is φ = 19040352.

The previous prime is 20230387. The next prime is 20230393. The reversal of 20230391 is 19303202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20230391 - 2² = 20230387 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 (20230393) 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, 594995 + ... + 595028.

It is an arithmetic number, because the mean of its divisors is an integer number (5355108).

Almost surely, 2^20230391 is an apocalyptic number.

20230391 is a deficient number, since it is larger than the sum of its proper divisors (1190041).

20230391 is a wasteful number, since it uses less digits than its factorization.

20230391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1190040.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 20230391 is about 4497.8206945142. The cubic root of 20230391 is about 272.4800804675.

Adding to 20230391 its reverse (19303202), we get a palindrome (39533593).

The spelling of 20230391 in words is "twenty million, two hundred thirty thousand, three hundred ninety-one".