20444397 has 8 divisors (see below), whose sum is σ = 27332640. Its totient is φ = 13592880.

The previous prime is 20444381. The next prime is 20444429. The reversal of 20444397 is 79344402.

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

It is not a de Polignac number, because 20444397 - 2⁴ = 20444381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20444327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7854 + ... + 10127.

It is an arithmetic number, because the mean of its divisors is an integer number (3416580).

Almost surely, 2^20444397 is an apocalyptic number.

It is an amenable number.

20444397 is a deficient number, since it is larger than the sum of its proper divisors (6888243).

20444397 is a wasteful number, since it uses less digits than its factorization.

20444397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18363.

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 20444397 is about 4521.5480756042. The cubic root of 20444397 is about 273.4375171287.

Adding to 20444397 its reverse (79344402), we get a palindrome (99788799).

It can be divided in two parts, 2044 and 4397, that added together give a triangular number (6441 = T₁₁₃).

The spelling of 20444397 in words is "twenty million, four hundred forty-four thousand, three hundred ninety-seven".