20857448 has 8 divisors (see below), whose sum is σ = 39107730. Its totient is φ = 10428720.

The previous prime is 20857429. The next prime is 20857469. The reversal of 20857448 is 84475802.

It can be written as a sum of positive squares in only one way, i.e., 17960644 + 2896804 = 4238^2 + 1702^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1303583 + ... + 1303598.

Almost surely, 2^20857448 is an apocalyptic number.

It is an amenable number.

20857448 is a deficient number, since it is larger than the sum of its proper divisors (18250282).

20857448 is a wasteful number, since it uses less digits than its factorization.

20857448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2607187 (or 2607183 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 38.

The square root of 20857448 is about 4566.9955112743. The cubic root of 20857448 is about 275.2667296381.

The spelling of 20857448 in words is "twenty million, eight hundred fifty-seven thousand, four hundred forty-eight".