20798988 has 24 divisors (see below), whose sum is σ = 55464192. Its totient is φ = 5942544.

The previous prime is 20798959. The next prime is 20798989. The reversal of 20798988 is 88989702.

It is a self number, because there is not a number n which added to its sum of digits gives 20798988.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20798989) 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 7 ways as a sum of consecutive naturals, for example, 123720 + ... + 123887.

It is an arithmetic number, because the mean of its divisors is an integer number (2311008).

Almost surely, 2^20798988 is an apocalyptic number.

20798988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20798988 is an abundant number, since it is smaller than the sum of its proper divisors (34665204).

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

20798988 is a wasteful number, since it uses less digits than its factorization.

20798988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247621 (or 247619 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 51.

The square root of 20798988 is about 4560.5907512076. The cubic root of 20798988 is about 275.0093131832.

The spelling of 20798988 in words is "twenty million, seven hundred ninety-eight thousand, nine hundred eighty-eight".