20448440 has 16 divisors (see below), whose sum is σ = 46009080. Its totient is φ = 8179360.

The previous prime is 20448413. The next prime is 20448443. The reversal of 20448440 is 4484402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20448443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255566 + ... + 255645.

Almost surely, 2^20448440 is an apocalyptic number.

20448440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20448440 is an abundant number, since it is smaller than the sum of its proper divisors (25560640).

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

20448440 is a wasteful number, since it uses less digits than its factorization.

20448440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511222 (or 511218 counting only the distinct ones).

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

The square root of 20448440 is about 4521.9951348934. The cubic root of 20448440 is about 273.4555405675.

The spelling of 20448440 in words is "twenty million, four hundred forty-eight thousand, four hundred forty".