20426500 has 24 divisors (see below), whose sum is σ = 44612568. Its totient is φ = 8170400.

The previous prime is 20426473. The next prime is 20426509. The reversal of 20426500 is 562402.

It can be written as a sum of positive squares in 4 ways, for example, as 427716 + 19998784 = 654^2 + 4472^2 .

It is not an unprimeable number, because it can be changed into a prime (20426509) 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 7 ways as a sum of consecutive naturals, for example, 19927 + ... + 20926.

It is an arithmetic number, because the mean of its divisors is an integer number (1858857).

Almost surely, 2^20426500 is an apocalyptic number.

20426500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20426500 is an abundant number, since it is smaller than the sum of its proper divisors (24186068).

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

20426500 is a wasteful number, since it uses less digits than its factorization.

20426500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40872 (or 40860 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 20426500 is about 4519.5685634804. The cubic root of 20426500 is about 273.3577048795.

Adding to 20426500 its reverse (562402), we get a palindrome (20988902).

The spelling of 20426500 in words is "twenty million, four hundred twenty-six thousand, five hundred".