20871379 has 2 divisors, whose sum is σ = 20871380. Its totient is φ = 20871378.

The previous prime is 20871353. The next prime is 20871397. The reversal of 20871379 is 97317802.

Together with next prime (20871397) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20871379 - 2⁷ = 20871251 is a prime.

It is a super-2 number, since 2×20871379² = 871228922723282, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20871349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10435689 + 10435690.

It is an arithmetic number, because the mean of its divisors is an integer number (10435690).

Almost surely, 2^20871379 is an apocalyptic number.

20871379 is a deficient number, since it is larger than the sum of its proper divisors (1).

20871379 is an equidigital number, since it uses as much as digits as its factorization.

20871379 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 20871379 is about 4568.5204388292. The cubic root of 20871379 is about 275.3280009142.

The spelling of 20871379 in words is "twenty million, eight hundred seventy-one thousand, three hundred seventy-nine".