20043397 has 8 divisors (see below), whose sum is σ = 21988512. Its totient is φ = 18118800.

The previous prime is 20043343. The next prime is 20043403. The reversal of 20043397 is 79334002.

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 20043397 - 2⁷ = 20043269 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 (20043337) 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, 3043 + ... + 7024.

It is an arithmetic number, because the mean of its divisors is an integer number (2748564).

Almost surely, 2^20043397 is an apocalyptic number.

It is an amenable number.

20043397 is a deficient number, since it is larger than the sum of its proper divisors (1945115).

20043397 is a wasteful number, since it uses less digits than its factorization.

20043397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10259.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 20043397 is about 4476.9852579610. The cubic root of 20043397 is about 271.6379491309.

Adding to 20043397 its reverse (79334002), we get a palindrome (99377399).

Subtracting 20043397 from its reverse (79334002), we obtain a triangular number (59290605 = T₁₀₈₈₉).

The spelling of 20043397 in words is "twenty million, forty-three thousand, three hundred ninety-seven".