20487297 has 8 divisors (see below), whose sum is σ = 27356320. Its totient is φ = 13638240.

The previous prime is 20487289. The next prime is 20487317. The reversal of 20487297 is 79278402.

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

It is not a de Polignac number, because 20487297 - 2³ = 20487289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20487697) 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, 2404 + ... + 6837.

It is an arithmetic number, because the mean of its divisors is an integer number (3419540).

Almost surely, 2^20487297 is an apocalyptic number.

It is an amenable number.

20487297 is a deficient number, since it is larger than the sum of its proper divisors (6869023).

20487297 is an equidigital number, since it uses as much as digits as its factorization.

20487297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9983.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 20487297 is about 4526.2895400096. The cubic root of 20487297 is about 273.6286416059.

The spelling of 20487297 in words is "twenty million, four hundred eighty-seven thousand, two hundred ninety-seven".