20426560 has 112 divisors (see below), whose sum is σ = 60716160. Its totient is φ = 6359040.

The previous prime is 20426557. The next prime is 20426561. The reversal of 20426560 is 6562402.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20426561) 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, 24226 + ... + 25054.

Almost surely, 2^20426560 is an apocalyptic number.

20426560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20426560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30358080).

20426560 is an abundant number, since it is smaller than the sum of its proper divisors (40289600).

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

20426560 is a wasteful number, since it uses less digits than its factorization.

20426560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864 (or 854 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20426560 is about 4519.5752012772. The cubic root of 20426560 is about 273.3579725294.

Adding to 20426560 its reverse (6562402), we get a palindrome (26988962).

The spelling of 20426560 in words is "twenty million, four hundred twenty-six thousand, five hundred sixty".