20857296 has 80 divisors (see below), whose sum is σ = 56567808. Its totient is φ = 6614400.

The previous prime is 20857247. The next prime is 20857313. The reversal of 20857296 is 69275802.

It is a happy number.

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 15 ways as a sum of consecutive naturals, for example, 159151 + ... + 159281.

Almost surely, 2^20857296 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20857296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28283904).

20857296 is an abundant number, since it is smaller than the sum of its proper divisors (35710512).

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

20857296 is a wasteful number, since it uses less digits than its factorization.

20857296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 20857296 is about 4566.9788701066. The cubic root of 20857296 is about 275.2660609618.

The spelling of 20857296 in words is "twenty million, eight hundred fifty-seven thousand, two hundred ninety-six".