20421626 has 8 divisors (see below), whose sum is σ = 31688820. Its totient is φ = 9858688.

The previous prime is 20421593. The next prime is 20421629. The reversal of 20421626 is 62612402.

It can be written as a sum of positive squares in 2 ways, for example, as 20241001 + 180625 = 4499^2 + 425^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20421629) 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 3 ways as a sum of consecutive naturals, for example, 175991 + ... + 176106.

Almost surely, 2^20421626 is an apocalyptic number.

20421626 is a deficient number, since it is larger than the sum of its proper divisors (11267194).

20421626 is a wasteful number, since it uses less digits than its factorization.

20421626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352128.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 20421626 is about 4519.0293205510. The cubic root of 20421626 is about 273.3359610429.

The spelling of 20421626 in words is "twenty million, four hundred twenty-one thousand, six hundred twenty-six".