20421826 has 8 divisors (see below), whose sum is σ = 30652560. Its totient is φ = 10204308.

The previous prime is 20421803. The next prime is 20421859. The reversal of 20421826 is 62812402.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20421826.

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 3 ways as a sum of consecutive naturals, for example, 2865 + ... + 7003.

It is an arithmetic number, because the mean of its divisors is an integer number (3831570).

Almost surely, 2^20421826 is an apocalyptic number.

20421826 is a deficient number, since it is larger than the sum of its proper divisors (10230734).

20421826 is a wasteful number, since it uses less digits than its factorization.

20421826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6608.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 20421826 is about 4519.0514491428. The cubic root of 20421826 is about 273.3368533488.

The spelling of 20421826 in words is "twenty million, four hundred twenty-one thousand, eight hundred twenty-six".