20422445 has 8 divisors (see below), whose sum is σ = 24566136. Its totient is φ = 16298496.

The previous prime is 20422439. The next prime is 20422447. The reversal of 20422445 is 54422402.

It can be written as a sum of positive squares in 4 ways, for example, as 806404 + 19616041 = 898^2 + 4429^2 .

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 20422445 - 2⁸ = 20422189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20422445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20422447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2552 + ... + 6881.

It is an arithmetic number, because the mean of its divisors is an integer number (3070767).

Almost surely, 2^20422445 is an apocalyptic number.

It is an amenable number.

20422445 is a deficient number, since it is larger than the sum of its proper divisors (4143691).

20422445 is an equidigital number, since it uses as much as digits as its factorization.

20422445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9871.

The product of its (nonzero) digits is 2560, while the sum is 23.

The square root of 20422445 is about 4519.1199364478. The cubic root of 20422445 is about 273.3396149987.

Adding to 20422445 its reverse (54422402), we get a palindrome (74844847).

The spelling of 20422445 in words is "twenty million, four hundred twenty-two thousand, four hundred forty-five".