20788812 has 120 divisors (see below), whose sum is σ = 62610240. Its totient is φ = 5948640.

The previous prime is 20788811. The next prime is 20788813. The reversal of 20788812 is 21888702.

It is an interprime number because it is at equal distance from previous prime (20788811) and next prime (20788813).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20788811) 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 39 ways as a sum of consecutive naturals, for example, 67563 + ... + 67869.

It is an arithmetic number, because the mean of its divisors is an integer number (521752).

Almost surely, 2^20788812 is an apocalyptic number.

20788812 is a gapful number since it is divisible by the number (22) 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 20788812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31305120).

20788812 is an abundant number, since it is smaller than the sum of its proper divisors (41821428).

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

20788812 is a wasteful number, since it uses less digits than its factorization.

20788812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353 (or 342 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 20788812 is about 4559.4749697745. The cubic root of 20788812 is about 274.9644560122.

The spelling of 20788812 in words is "twenty million, seven hundred eighty-eight thousand, eight hundred twelve".