20857488 has 40 divisors (see below), whose sum is σ = 54047136. Its totient is φ = 6931200.

The previous prime is 20857483. The next prime is 20857511. The reversal of 20857488 is 88475802.

It is a Cunningham number, because it is equal to 4567²-1.

It is not an unprimeable number, because it can be changed into a prime (20857483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27028 + ... + 27788.

Almost surely, 2^20857488 is an apocalyptic number.

It is an amenable number.

20857488 is an abundant number, since it is smaller than the sum of its proper divisors (33189648).

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

20857488 is a wasteful number, since it uses less digits than its factorization.

20857488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343 (or 1337 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 42.

The square root of 20857488 is about 4566.9998905189. Note that the first 3 decimals coincide. The cubic root of 20857488 is about 275.2669056050.

The spelling of 20857488 in words is "twenty million, eight hundred fifty-seven thousand, four hundred eighty-eight".