20422405 has 8 divisors (see below), whose sum is σ = 24554232. Its totient is φ = 16306368.

The previous prime is 20422357. The next prime is 20422421. The reversal of 20422405 is 50422402.

It can be written as a sum of positive squares in 4 ways, for example, as 1473796 + 18948609 = 1214^2 + 4353^2 .

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 20422405 - 2⁷ = 20422277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 882 + ... + 6451.

It is an arithmetic number, because the mean of its divisors is an integer number (3069279).

Almost surely, 2^20422405 is an apocalyptic number.

It is an amenable number.

20422405 is a deficient number, since it is larger than the sum of its proper divisors (4131827).

20422405 is an equidigital number, since it uses as much as digits as its factorization.

20422405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7895.

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 20422405 is about 4519.1155108052. The cubic root of 20422405 is about 273.3394365416.

Adding to 20422405 its reverse (50422402), we get a palindrome (70844807).

The spelling of 20422405 in words is "twenty million, four hundred twenty-two thousand, four hundred five".