20426830 has 32 divisors (see below), whose sum is σ = 38320128. Its totient is φ = 7831200.

The previous prime is 20426821. The next prime is 20426831. The reversal of 20426830 is 3862402.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20426795 and 20426804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20426831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40359 + ... + 40861.

It is an arithmetic number, because the mean of its divisors is an integer number (1197504).

Almost surely, 2^20426830 is an apocalyptic number.

20426830 is a deficient number, since it is larger than the sum of its proper divisors (17893298).

20426830 is a wasteful number, since it uses less digits than its factorization.

20426830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 20426830 is about 4519.6050712424. The cubic root of 20426830 is about 273.3591769470.

The spelling of 20426830 in words is "twenty million, four hundred twenty-six thousand, eight hundred thirty".