20422849 has 4 divisors (see below), whose sum is σ = 20442564. Its totient is φ = 20403136.

The previous prime is 20422847. The next prime is 20422859. The reversal of 20422849 is 94822402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14197824 + 6225025 = 3768^2 + 2495^2 .

It is a cyclic number.

It is not a de Polignac number, because 20422849 - 2¹ = 20422847 is a prime.

It is a super-2 number, since 2×20422849² = 834185522553602, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20422849.

It is not an unprimeable number, because it can be changed into a prime (20422847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8212 + ... + 10405.

It is an arithmetic number, because the mean of its divisors is an integer number (5110641).

Almost surely, 2^20422849 is an apocalyptic number.

It is an amenable number.

20422849 is a deficient number, since it is larger than the sum of its proper divisors (19715).

20422849 is a wasteful number, since it uses less digits than its factorization.

20422849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19714.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 20422849 is about 4519.1646351953. The cubic root of 20422849 is about 273.3414174025.

The spelling of 20422849 in words is "twenty million, four hundred twenty-two thousand, eight hundred forty-nine".