20872427 has 2 divisors, whose sum is σ = 20872428. Its totient is φ = 20872426.

The previous prime is 20872421. The next prime is 20872429. The reversal of 20872427 is 72427802.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20872427 - 2¹⁸ = 20610283 is a prime.

Together with 20872429, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20872393 and 20872402.

It is not a weakly prime, because it can be changed into another prime (20872421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10436213 + 10436214.

It is an arithmetic number, because the mean of its divisors is an integer number (10436214).

Almost surely, 2^20872427 is an apocalyptic number.

20872427 is a deficient number, since it is larger than the sum of its proper divisors (1).

20872427 is an equidigital number, since it uses as much as digits as its factorization.

20872427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 20872427 is about 4568.6351353550. The cubic root of 20872427 is about 275.3326091214.

The spelling of 20872427 in words is "twenty million, eight hundred seventy-two thousand, four hundred twenty-seven".