20001799 has 2 divisors, whose sum is σ = 20001800. Its totient is φ = 20001798.

The previous prime is 20001797. The next prime is 20001811. The reversal of 20001799 is 99710002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20001799 - 2¹ = 20001797 is a prime.

Together with 20001797, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20001797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000899 + 10000900.

It is an arithmetic number, because the mean of its divisors is an integer number (10000900).

Almost surely, 2^20001799 is an apocalyptic number.

20001799 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001799 is an equidigital number, since it uses as much as digits as its factorization.

20001799 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134, while the sum is 28.

The square root of 20001799 is about 4472.3370847914. The cubic root of 20001799 is about 271.4499001443.

The spelling of 20001799 in words is "twenty million, one thousand, seven hundred ninety-nine".