20488397 has 4 divisors (see below), whose sum is σ = 20988156. Its totient is φ = 19988640.

The previous prime is 20488387. The next prime is 20488409. The reversal of 20488397 is 79388402.

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

It can be written as a sum of positive squares in 2 ways, for example, as 872356 + 19616041 = 934^2 + 4429^2 .

It is a cyclic number.

It is not a de Polignac number, because 20488397 - 2⁶ = 20488333 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 499717 = 20488397 / (2 + 0 + 4 + 8 + 8 + 3 + 9 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20488337) 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 3 ways as a sum of consecutive naturals, for example, 249818 + ... + 249899.

It is an arithmetic number, because the mean of its divisors is an integer number (5247039).

Almost surely, 2^20488397 is an apocalyptic number.

It is an amenable number.

20488397 is a deficient number, since it is larger than the sum of its proper divisors (499759).

20488397 is an equidigital number, since it uses as much as digits as its factorization.

20488397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499758.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 20488397 is about 4526.4110507111. The cubic root of 20488397 is about 273.6335387237.

The spelling of 20488397 in words is "twenty million, four hundred eighty-eight thousand, three hundred ninety-seven".