20867028 has 96 divisors (see below), whose sum is σ = 60850944. Its totient is φ = 5419008.

The previous prime is 20867023. The next prime is 20867039. The reversal of 20867028 is 82076802.

It is a self number, because there is not a number n which added to its sum of digits gives 20867028.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20867023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105826 + ... + 106022.

It is an arithmetic number, because the mean of its divisors is an integer number (633864).

Almost surely, 2^20867028 is an apocalyptic number.

20867028 is a gapful number since it is divisible by the number (28) 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 20867028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30425472).

20867028 is an abundant number, since it is smaller than the sum of its proper divisors (39983916).

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

20867028 is a wasteful number, since it uses less digits than its factorization.

20867028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321 (or 319 counting only the distinct ones).

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

The square root of 20867028 is about 4568.0442204515. The cubic root of 20867028 is about 275.3088672897.

The spelling of 20867028 in words is "twenty million, eight hundred sixty-seven thousand, twenty-eight".