20297923 has 4 divisors (see below), whose sum is σ = 20319280. Its totient is φ = 20276568.

The previous prime is 20297903. The next prime is 20297969. The reversal of 20297923 is 32979202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32979202 = 2 ⋅16489601.

It is a cyclic number.

It is not a de Polignac number, because 20297923 - 2¹⁷ = 20166851 is a prime.

It is a super-2 number, since 2×20297923² = 824011356227858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20297903) 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 3 ways as a sum of consecutive naturals, for example, 9183 + ... + 11176.

It is an arithmetic number, because the mean of its divisors is an integer number (5079820).

Almost surely, 2^20297923 is an apocalyptic number.

20297923 is a deficient number, since it is larger than the sum of its proper divisors (21357).

20297923 is an equidigital number, since it uses as much as digits as its factorization.

20297923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21356.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 20297923 is about 4505.3216311380. The cubic root of 20297923 is about 272.7829364934.

The spelling of 20297923 in words is "twenty million, two hundred ninety-seven thousand, nine hundred twenty-three".