20487856 has 20 divisors (see below), whose sum is σ = 42030792. Its totient is φ = 9641216.

The previous prime is 20487853. The next prime is 20487877. The reversal of 20487856 is 65878402.

It is not an unprimeable number, because it can be changed into a prime (20487853) 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, 37390 + ... + 37933.

Almost surely, 2^20487856 is an apocalyptic number.

It is an amenable number.

20487856 is an abundant number, since it is smaller than the sum of its proper divisors (21542936).

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

20487856 is a wasteful number, since it uses less digits than its factorization.

20487856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75348 (or 75342 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 20487856 is about 4526.3512899465. The cubic root of 20487856 is about 273.6311302540.

The spelling of 20487856 in words is "twenty million, four hundred eighty-seven thousand, eight hundred fifty-six".