20408444 has 12 divisors (see below), whose sum is σ = 40816944. Its totient is φ = 8746464.

The previous prime is 20408419. The next prime is 20408459. The reversal of 20408444 is 44480402.

20408444 is an admirable number.

It is a super-2 number, since 2×20408444² = 833009173002272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 364409 + ... + 364464.

It is an arithmetic number, because the mean of its divisors is an integer number (3401412).

Almost surely, 2^20408444 is an apocalyptic number.

It is an amenable number.

20408444 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20408444 is a wasteful number, since it uses less digits than its factorization.

20408444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728884 (or 728882 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 26.

The square root of 20408444 is about 4517.5705860562. The cubic root of 20408444 is about 273.2771363085.

Adding to 20408444 its reverse (44480402), we get a palindrome (64888846).

The spelling of 20408444 in words is "twenty million, four hundred eight thousand, four hundred forty-four".