20985467 has 2 divisors, whose sum is σ = 20985468. Its totient is φ = 20985466.

The previous prime is 20985449. The next prime is 20985479. The reversal of 20985467 is 76458902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20985467 - 2¹² = 20981371 is a prime.

It is not a weakly prime, because it can be changed into another prime (20985487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10492733 + 10492734.

It is an arithmetic number, because the mean of its divisors is an integer number (10492734).

Almost surely, 2^20985467 is an apocalyptic number.

20985467 is a deficient number, since it is larger than the sum of its proper divisors (1).

20985467 is an equidigital number, since it uses as much as digits as its factorization.

20985467 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 20985467 is about 4580.9897402199. The cubic root of 20985467 is about 275.8287593874.

The spelling of 20985467 in words is "twenty million, nine hundred eighty-five thousand, four hundred sixty-seven".