20409426 has 12 divisors (see below), whose sum is σ = 44220462. Its totient is φ = 6803136.

The previous prime is 20409383. The next prime is 20409437. The reversal of 20409426 is 62490402.

It can be written as a sum of positive squares in only one way, i.e., 14402025 + 6007401 = 3795^2 + 2451^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20409426.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 566911 + ... + 566946.

Almost surely, 2^20409426 is an apocalyptic number.

20409426 is an abundant number, since it is smaller than the sum of its proper divisors (23811036).

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

20409426 is a wasteful number, since it uses less digits than its factorization.

20409426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1133865 (or 1133862 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 20409426 is about 4517.6792714844. The cubic root of 20409426 is about 273.2815193610.

Adding to 20409426 its reverse (62490402), we get a palindrome (82899828).

The spelling of 20409426 in words is "twenty million, four hundred nine thousand, four hundred twenty-six".