20775899 has 2 divisors, whose sum is σ = 20775900. Its totient is φ = 20775898.

The previous prime is 20775883. The next prime is 20775901. The reversal of 20775899 is 99857702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20775899 - 2⁴ = 20775883 is a prime.

It is a Sophie Germain prime.

Together with 20775901, 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 (20775809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10387949 + 10387950.

It is an arithmetic number, because the mean of its divisors is an integer number (10387950).

Almost surely, 2^20775899 is an apocalyptic number.

20775899 is a deficient number, since it is larger than the sum of its proper divisors (1).

20775899 is an equidigital number, since it uses as much as digits as its factorization.

20775899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 47.

The square root of 20775899 is about 4558.0586876432. The cubic root of 20775899 is about 274.9075127000.

The spelling of 20775899 in words is "twenty million, seven hundred seventy-five thousand, eight hundred ninety-nine".