20422399 has 8 divisors (see below), whose sum is σ = 20790000. Its totient is φ = 20057856.

The previous prime is 20422357. The next prime is 20422421. The reversal of 20422399 is 99322402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20422399 - 2¹⁵ = 20389631 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 20422399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20422309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15727 + ... + 16975.

It is an arithmetic number, because the mean of its divisors is an integer number (2598750).

Almost surely, 2^20422399 is an apocalyptic number.

20422399 is a deficient number, since it is larger than the sum of its proper divisors (367601).

20422399 is a wasteful number, since it uses less digits than its factorization.

20422399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1529.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 20422399 is about 4519.1148469584. The cubic root of 20422399 is about 273.3394097730.

The spelling of 20422399 in words is "twenty million, four hundred twenty-two thousand, three hundred ninety-nine".