20400827 has 2 divisors, whose sum is σ = 20400828. Its totient is φ = 20400826.

The previous prime is 20400823. The next prime is 20400829. The reversal of 20400827 is 72800402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20400827 - 2² = 20400823 is a prime.

Together with 20400829, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20400823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200413 + 10200414.

It is an arithmetic number, because the mean of its divisors is an integer number (10200414).

Almost surely, 2^20400827 is an apocalyptic number.

20400827 is a deficient number, since it is larger than the sum of its proper divisors (1).

20400827 is an equidigital number, since it uses as much as digits as its factorization.

20400827 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 20400827 is about 4516.7274657655. The cubic root of 20400827 is about 273.2431338638.

The spelling of 20400827 in words is "twenty million, four hundred thousand, eight hundred twenty-seven".