20247297 has 16 divisors (see below), whose sum is σ = 30955392. Its totient is φ = 11531520.

The previous prime is 20247263. The next prime is 20247301. The reversal of 20247297 is 79274202.

It is not a de Polignac number, because 20247297 - 2⁸ = 20247041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20247257) 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 15 ways as a sum of consecutive naturals, for example, 5647 + ... + 8507.

It is an arithmetic number, because the mean of its divisors is an integer number (1934712).

Almost surely, 2^20247297 is an apocalyptic number.

It is an amenable number.

20247297 is a deficient number, since it is larger than the sum of its proper divisors (10708095).

20247297 is a wasteful number, since it uses less digits than its factorization.

20247297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3208.

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 20247297 is about 4499.6996566438. The cubic root of 20247297 is about 272.5559607877. Note that the first 3 decimals are identical.

The spelling of 20247297 in words is "twenty million, two hundred forty-seven thousand, two hundred ninety-seven".