20487445 has 16 divisors (see below), whose sum is σ = 26982720. Its totient is φ = 14809600.

The previous prime is 20487433. The next prime is 20487449. The reversal of 20487445 is 54478402.

It is a happy number.

It is not a de Polignac number, because 20487445 - 2⁷ = 20487317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20487445.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8805 + ... + 10885.

It is an arithmetic number, because the mean of its divisors is an integer number (1686420).

Almost surely, 2^20487445 is an apocalyptic number.

It is an amenable number.

20487445 is a deficient number, since it is larger than the sum of its proper divisors (6495275).

20487445 is a wasteful number, since it uses less digits than its factorization.

20487445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2276.

The product of its (nonzero) digits is 35840, while the sum is 34.

The square root of 20487445 is about 4526.3058889121. The cubic root of 20487445 is about 273.6293005010.

The spelling of 20487445 in words is "twenty million, four hundred eighty-seven thousand, four hundred forty-five".