20897827 has 2 divisors, whose sum is σ = 20897828. Its totient is φ = 20897826.

The previous prime is 20897819. The next prime is 20897839. The reversal of 20897827 is 72879802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20897827 - 2³ = 20897819 is a prime.

It is not a weakly prime, because it can be changed into another prime (20897857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10448913 + 10448914.

It is an arithmetic number, because the mean of its divisors is an integer number (10448914).

Almost surely, 2^20897827 is an apocalyptic number.

20897827 is a deficient number, since it is larger than the sum of its proper divisors (1).

20897827 is an equidigital number, since it uses as much as digits as its factorization.

20897827 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 20897827 is about 4571.4141138164. The cubic root of 20897827 is about 275.4442494428. Note that the first 3 decimals are identical.

The spelling of 20897827 in words is "twenty million, eight hundred ninety-seven thousand, eight hundred twenty-seven".