20426478 has 16 divisors (see below), whose sum is σ = 40928976. Its totient is φ = 6796160.

The previous prime is 20426473. The next prime is 20426509. The reversal of 20426478 is 87462402.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20426473) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 688 + ... + 6428.

It is an arithmetic number, because the mean of its divisors is an integer number (2558061).

Almost surely, 2^20426478 is an apocalyptic number.

20426478 is an abundant number, since it is smaller than the sum of its proper divisors (20502498).

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

20426478 is a wasteful number, since it uses less digits than its factorization.

20426478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6339.

The product of its (nonzero) digits is 21504, while the sum is 33.

The square root of 20426478 is about 4519.5661296191. The cubic root of 20426478 is about 273.3576067412.

The spelling of 20426478 in words is "twenty million, four hundred twenty-six thousand, four hundred seventy-eight".