20842297 has 24 divisors (see below), whose sum is σ = 26010240. Its totient is φ = 16601760.

The previous prime is 20842279. The next prime is 20842319. The reversal of 20842297 is 79224802.

It is not a de Polignac number, because 20842297 - 2⁷ = 20842169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20842247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56608 + ... + 56974.

It is an arithmetic number, because the mean of its divisors is an integer number (1083760).

Almost surely, 2^20842297 is an apocalyptic number.

It is an amenable number.

20842297 is a deficient number, since it is larger than the sum of its proper divisors (5167943).

20842297 is a wasteful number, since it uses less digits than its factorization.

20842297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461 (or 454 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 20842297 is about 4565.3364607661. The cubic root of 20842297 is about 275.2000615831.

The spelling of 20842297 in words is "twenty million, eight hundred forty-two thousand, two hundred ninety-seven".