20678280 has 128 divisors (see below), whose sum is σ = 71884800. Its totient is φ = 4660992.

The previous prime is 20678279. The next prime is 20678291. The reversal of 20678280 is 8287602.

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 31 ways as a sum of consecutive naturals, for example, 86401 + ... + 86639.

It is an arithmetic number, because the mean of its divisors is an integer number (561600).

Almost surely, 2^20678280 is an apocalyptic number.

20678280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20678280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35942400).

20678280 is an abundant number, since it is smaller than the sum of its proper divisors (51206520).

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

20678280 is a wasteful number, since it uses less digits than its factorization.

20678280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363 (or 359 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 20678280 is about 4547.3376826446. The cubic root of 20678280 is about 274.4762704229.

The spelling of 20678280 in words is "twenty million, six hundred seventy-eight thousand, two hundred eighty".