20871299 has 2 divisors, whose sum is σ = 20871300. Its totient is φ = 20871298.

The previous prime is 20871287. The next prime is 20871311. The reversal of 20871299 is 99217802.

It is a balanced prime because it is at equal distance from previous prime (20871287) and next prime (20871311).

It is a cyclic number.

It is not a de Polignac number, because 20871299 - 2⁴ = 20871283 is a prime.

It is a super-2 number, since 2×20871299² = 871222243894802, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20871209) 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 as a sum of consecutive naturals, namely, 10435649 + 10435650.

It is an arithmetic number, because the mean of its divisors is an integer number (10435650).

Almost surely, 2^20871299 is an apocalyptic number.

20871299 is a deficient number, since it is larger than the sum of its proper divisors (1).

20871299 is an equidigital number, since it uses as much as digits as its factorization.

20871299 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 20871299 is about 4568.5116832509. The cubic root of 20871299 is about 275.3276491364.

The spelling of 20871299 in words is "twenty million, eight hundred seventy-one thousand, two hundred ninety-nine".