20857792 has 28 divisors (see below), whose sum is σ = 42728896. Its totient is φ = 10091520.

The previous prime is 20857783. The next prime is 20857829. The reversal of 20857792 is 29775802.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 3273 + ... + 7240.

It is an arithmetic number, because the mean of its divisors is an integer number (1526032).

Almost surely, 2^20857792 is an apocalyptic number.

It is an amenable number.

20857792 is an abundant number, since it is smaller than the sum of its proper divisors (21871104).

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

20857792 is a wasteful number, since it uses less digits than its factorization.

20857792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10556 (or 10546 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 20857792 is about 4567.0331726406. The cubic root of 20857792 is about 275.2682429462.

The spelling of 20857792 in words is "twenty million, eight hundred fifty-seven thousand, seven hundred ninety-two".