20996688 has 80 divisors (see below), whose sum is σ = 56460672. Its totient is φ = 6720000.

The previous prime is 20996687. The next prime is 20996713. The reversal of 20996688 is 88669902.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20996681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207838 + ... + 207938.

Almost surely, 2^20996688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20996688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28230336).

20996688 is an abundant number, since it is smaller than the sum of its proper divisors (35463984).

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

20996688 is a wasteful number, since it uses less digits than its factorization.

20996688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 48.

The square root of 20996688 is about 4582.2143118802. The cubic root of 20996688 is about 275.8779128170.

The spelling of 20996688 in words is "twenty million, nine hundred ninety-six thousand, six hundred eighty-eight".