20402228 has 36 divisors (see below), whose sum is σ = 45313632. Its totient is φ = 7948080.

The previous prime is 20402209. The next prime is 20402231. The reversal of 20402228 is 82220402.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 2576 + ... + 6887.

It is an arithmetic number, because the mean of its divisors is an integer number (1258712).

Almost surely, 2^20402228 is an apocalyptic number.

20402228 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20402228 is an abundant number, since it is smaller than the sum of its proper divisors (24911404).

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

20402228 is a wasteful number, since it uses less digits than its factorization.

20402228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9492 (or 9483 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 20402228 is about 4516.8825532661. The cubic root of 20402228 is about 273.2493885917.

The spelling of 20402228 in words is "twenty million, four hundred two thousand, two hundred twenty-eight".