20240391 has 8 divisors (see below), whose sum is σ = 28160640. Its totient is φ = 12906872.

The previous prime is 20240383. The next prime is 20240399. The reversal of 20240391 is 19304202.

It is an interprime number because it is at equal distance from previous prime (20240383) and next prime (20240399).

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

It is a cyclic number.

It is not a de Polignac number, because 20240391 - 2³ = 20240383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20240399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146601 + ... + 146738.

It is an arithmetic number, because the mean of its divisors is an integer number (3520080).

Almost surely, 2^20240391 is an apocalyptic number.

20240391 is a deficient number, since it is larger than the sum of its proper divisors (7920249).

20240391 is a wasteful number, since it uses less digits than its factorization.

20240391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293365.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 20240391 is about 4498.9322066464. The cubic root of 20240391 is about 272.5249692352.

Adding to 20240391 its reverse (19304202), we get a palindrome (39544593).

The spelling of 20240391 in words is "twenty million, two hundred forty thousand, three hundred ninety-one".