20912297 has 8 divisors (see below), whose sum is σ = 23933952. Its totient is φ = 17899200.

The previous prime is 20912291. The next prime is 20912303. The reversal of 20912297 is 79221902.

It is an interprime number because it is at equal distance from previous prime (20912291) and next prime (20912303).

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

It is a cyclic number.

It is not a de Polignac number, because 20912297 - 2⁸ = 20912041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20912291) 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 7 ways as a sum of consecutive naturals, for example, 4472 + ... + 7862.

It is an arithmetic number, because the mean of its divisors is an integer number (2991744).

Almost surely, 2^20912297 is an apocalyptic number.

It is an amenable number.

20912297 is a deficient number, since it is larger than the sum of its proper divisors (3021655).

20912297 is an equidigital number, since it uses as much as digits as its factorization.

20912297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4279.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 20912297 is about 4572.9965012014. The cubic root of 20912297 is about 275.5078088219.

Adding to 20912297 its sum of digits (32), we get a square (20912329 = 4573²).

The spelling of 20912297 in words is "twenty million, nine hundred twelve thousand, two hundred ninety-seven".