20505626 has 8 divisors (see below), whose sum is σ = 31063284. Its totient is φ = 10151200.

The previous prime is 20505623. The next prime is 20505643. The reversal of 20505626 is 62650502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14250625 + 6255001 = 3775^2 + 2501^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20505595 and 20505604.

It is not an unprimeable number, because it can be changed into a prime (20505623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50555 + ... + 50958.

Almost surely, 2^20505626 is an apocalyptic number.

20505626 is a deficient number, since it is larger than the sum of its proper divisors (10557658).

20505626 is a wasteful number, since it uses less digits than its factorization.

20505626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101616.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 20505626 is about 4528.3138142139. The cubic root of 20505626 is about 273.7102180815.

The spelling of 20505626 in words is "twenty million, five hundred five thousand, six hundred twenty-six".