20787828 has 12 divisors (see below), whose sum is σ = 48504960. Its totient is φ = 6929272.

The previous prime is 20787827. The next prime is 20787829. The reversal of 20787828 is 82878702.

It is an interprime number because it is at equal distance from previous prime (20787827) and next prime (20787829).

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 20787828.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20787827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 866148 + ... + 866171.

It is an arithmetic number, because the mean of its divisors is an integer number (4042080).

Almost surely, 2^20787828 is an apocalyptic number.

It is an amenable number.

20787828 is an abundant number, since it is smaller than the sum of its proper divisors (27717132).

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

20787828 is a wasteful number, since it uses less digits than its factorization.

20787828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1732326 (or 1732324 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 42.

The square root of 20787828 is about 4559.3670613365. The cubic root of 20787828 is about 274.9601176322.

The spelling of 20787828 in words is "twenty million, seven hundred eighty-seven thousand, eight hundred twenty-eight".