20022399 has 12 divisors (see below), whose sum is σ = 29073616. Its totient is φ = 13277952.

The previous prime is 20022323. The next prime is 20022407. The reversal of 20022399 is 99322002.

It is not a de Polignac number, because 20022399 - 2⁹ = 20021887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20022199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4027 + ... + 7500.

Almost surely, 2^20022399 is an apocalyptic number.

20022399 is a deficient number, since it is larger than the sum of its proper divisors (9051217).

20022399 is a wasteful number, since it uses less digits than its factorization.

20022399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11726 (or 11723 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 20022399 is about 4474.6395385550. The cubic root of 20022399 is about 271.5430575871.

The spelling of 20022399 in words is "twenty million, twenty-two thousand, three hundred ninety-nine".