20968280 has 32 divisors (see below), whose sum is σ = 47606400. Its totient is φ = 8311296.

The previous prime is 20968279. The next prime is 20968291. The reversal of 20968280 is 8286902.

It is a self number, because there is not a number n which added to its sum of digits gives 20968280.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2201 + ... + 6839.

It is an arithmetic number, because the mean of its divisors is an integer number (1487700).

Almost surely, 2^20968280 is an apocalyptic number.

20968280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20968280 is an abundant number, since it is smaller than the sum of its proper divisors (26638120).

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

20968280 is a wasteful number, since it uses less digits than its factorization.

20968280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4763 (or 4759 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 20968280 is about 4579.1134513135. The cubic root of 20968280 is about 275.7534379968.

The spelling of 20968280 in words is "twenty million, nine hundred sixty-eight thousand, two hundred eighty".