20331493 has 8 divisors (see below), whose sum is σ = 25023488. Its totient is φ = 16086384.

The previous prime is 20331481. The next prime is 20331503. The reversal of 20331493 is 39413302.

It is a happy number.

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 20331493 - 2⁵ = 20331461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20331403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111621 + ... + 111802.

It is an arithmetic number, because the mean of its divisors is an integer number (3127936).

Almost surely, 2^20331493 is an apocalyptic number.

It is an amenable number.

20331493 is a deficient number, since it is larger than the sum of its proper divisors (4691995).

20331493 is a wasteful number, since it uses less digits than its factorization.

20331493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223443.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 20331493 is about 4509.0456861735. The cubic root of 20331493 is about 272.9332356068.

Adding to 20331493 its reverse (39413302), we get a palindrome (59744795).

The spelling of 20331493 in words is "twenty million, three hundred thirty-one thousand, four hundred ninety-three".