20402226 has 32 divisors (see below), whose sum is σ = 48827520. Its totient is φ = 6277392.

The previous prime is 20402209. The next prime is 20402231. The reversal of 20402226 is 62220402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20402199 and 20402208.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 13830 + ... + 15233.

It is an arithmetic number, because the mean of its divisors is an integer number (1525860).

Almost surely, 2^20402226 is an apocalyptic number.

20402226 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20402226 is an abundant number, since it is smaller than the sum of its proper divisors (28425294).

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

20402226 is a wasteful number, since it uses less digits than its factorization.

20402226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29087 (or 29081 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 20402226 is about 4516.8823318745. The cubic root of 20402226 is about 273.2493796630.

Adding to 20402226 its reverse (62220402), we get a palindrome (82622628).

The spelling of 20402226 in words is "twenty million, four hundred two thousand, two hundred twenty-six".