20821627 has 2 divisors, whose sum is σ = 20821628. Its totient is φ = 20821626.

The previous prime is 20821609. The next prime is 20821637. The reversal of 20821627 is 72612802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20821627 - 2⁷ = 20821499 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20821595 and 20821604.

It is not a weakly prime, because it can be changed into another prime (20821607) 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, 10410813 + 10410814.

It is an arithmetic number, because the mean of its divisors is an integer number (10410814).

Almost surely, 2^20821627 is an apocalyptic number.

20821627 is a deficient number, since it is larger than the sum of its proper divisors (1).

20821627 is an equidigital number, since it uses as much as digits as its factorization.

20821627 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 20821627 is about 4563.0721011178. The cubic root of 20821627 is about 275.1090564704.

The spelling of 20821627 in words is "twenty million, eight hundred twenty-one thousand, six hundred twenty-seven".