20447699 has 2 divisors, whose sum is σ = 20447700. Its totient is φ = 20447698.

The previous prime is 20447683. The next prime is 20447711. The reversal of 20447699 is 99674402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20447699 - 2⁴ = 20447683 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20447899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10223849 + 10223850.

It is an arithmetic number, because the mean of its divisors is an integer number (10223850).

Almost surely, 2^20447699 is an apocalyptic number.

20447699 is a deficient number, since it is larger than the sum of its proper divisors (1).

20447699 is an equidigital number, since it uses as much as digits as its factorization.

20447699 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 20447699 is about 4521.9132012899. The cubic root of 20447699 is about 273.4522374141.

The spelling of 20447699 in words is "twenty million, four hundred forty-seven thousand, six hundred ninety-nine".