20851248 has 160 divisors (see below), whose sum is σ = 65567232. Its totient is φ = 5632000.

The previous prime is 20851223. The next prime is 20851253. The reversal of 20851248 is 84215802.

It is a plaindrome in base 14.

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 31 ways as a sum of consecutive naturals, for example, 206398 + ... + 206498.

Almost surely, 2^20851248 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 20851248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32783616).

20851248 is an abundant number, since it is smaller than the sum of its proper divisors (44715984).

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

20851248 is a wasteful number, since it uses less digits than its factorization.

20851248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 20851248 is about 4566.3166775860. The cubic root of 20851248 is about 275.2394520463.

It can be divided in two parts, 2085 and 1248, that added together give a palindrome (3333).

The spelling of 20851248 in words is "twenty million, eight hundred fifty-one thousand, two hundred forty-eight".