20404222420 has 48 divisors (see below), whose sum is σ = 43267604688. Its totient is φ = 8082063360.

The previous prime is 20404222403. The next prime is 20404222453. The reversal of 20404222420 is 2422240402.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 285069456 + 20119152964 = 16884^2 + 141842^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20404222391 and 20404222400.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2927740 + ... + 2934700.

It is an arithmetic number, because the mean of its divisors is an integer number (901408431).

Almost surely, 2^20404222420 is an apocalyptic number.

20404222420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20404222420 is an abundant number, since it is smaller than the sum of its proper divisors (22863382268).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20404222420 is a wasteful number, since it uses less digits than its factorization.

20404222420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8380 (or 8378 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 22.

Adding to 20404222420 its reverse (2422240402), we get a palindrome (22826462822).

The spelling of 20404222420 in words is "twenty billion, four hundred four million, two hundred twenty-two thousand, four hundred twenty".