20866297 has 4 divisors (see below), whose sum is σ = 21072996. Its totient is φ = 20659600.

The previous prime is 20866291. The next prime is 20866303. The reversal of 20866297 is 79266802.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20866291) and next prime (20866303).

It can be written as a sum of positive squares in 2 ways, for example, as 14409616 + 6456681 = 3796^2 + 2541^2 .

It is a cyclic number.

It is not a de Polignac number, because 20866297 - 2³ = 20866289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20866291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103198 + ... + 103399.

It is an arithmetic number, because the mean of its divisors is an integer number (5268249).

Almost surely, 2^20866297 is an apocalyptic number.

It is an amenable number.

20866297 is a deficient number, since it is larger than the sum of its proper divisors (206699).

20866297 is a wasteful number, since it uses less digits than its factorization.

20866297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206698.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 20866297 is about 4567.9642073904. The cubic root of 20866297 is about 275.3056524391.

The spelling of 20866297 in words is "twenty million, eight hundred sixty-six thousand, two hundred ninety-seven".