20867568 has 80 divisors (see below), whose sum is σ = 57853440. Its totient is φ = 6458368.

The previous prime is 20867543. The next prime is 20867573. The reversal of 20867568 is 86576802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87193 + ... + 87431.

It is an arithmetic number, because the mean of its divisors is an integer number (723168).

Almost surely, 2^20867568 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 20867568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28926720).

20867568 is an abundant number, since it is smaller than the sum of its proper divisors (36985872).

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

20867568 is a wasteful number, since it uses less digits than its factorization.

20867568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 368 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 20867568 is about 4568.1033263270. The cubic root of 20867568 is about 275.3112420969.

It can be divided in two parts, 208 and 67568, that added together give a palindrome (67776).

The spelling of 20867568 in words is "twenty million, eight hundred sixty-seven thousand, five hundred sixty-eight".