20684226 has 16 divisors (see below), whose sum is σ = 41609664. Its totient is φ = 6854544.

The previous prime is 20684219. The next prime is 20684227. The reversal of 20684226 is 62248602.

It is a junction number, because it is equal to n+sod(n) for n = 20684193 and 20684202.

It is not an unprimeable number, because it can be changed into a prime (20684227) 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, 8926 + ... + 11001.

It is an arithmetic number, because the mean of its divisors is an integer number (2600604).

Almost surely, 2^20684226 is an apocalyptic number.

20684226 is an abundant number, since it is smaller than the sum of its proper divisors (20925438).

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

20684226 is a wasteful number, since it uses less digits than its factorization.

20684226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20105.

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 20684226 is about 4547.9914247940. The cubic root of 20684226 is about 274.5025762778.

It can be divided in two parts, 20684 and 226, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 20684226 in words is "twenty million, six hundred eighty-four thousand, two hundred twenty-six".