20487444 has 24 divisors (see below), whose sum is σ = 48343680. Its totient is φ = 6752064.

The previous prime is 20487433. The next prime is 20487449. The reversal of 20487444 is 44478402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20487449) 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 7 ways as a sum of consecutive naturals, for example, 8524 + ... + 10659.

It is an arithmetic number, because the mean of its divisors is an integer number (2014320).

Almost surely, 2^20487444 is an apocalyptic number.

It is an amenable number.

20487444 is an abundant number, since it is smaller than the sum of its proper divisors (27856236).

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

20487444 is a wasteful number, since it uses less digits than its factorization.

20487444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19279 (or 19277 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 33.

The square root of 20487444 is about 4526.3057784467. The cubic root of 20487444 is about 273.6292960491.

The spelling of 20487444 in words is "twenty million, four hundred eighty-seven thousand, four hundred forty-four".