20720976 has 60 divisors (see below), whose sum is σ = 56267232. Its totient is φ = 6558464.

The previous prime is 20720971. The next prime is 20721013. The reversal of 20720976 is 67902702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20720971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 151180 + ... + 151316.

Almost surely, 2^20720976 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 20720976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28133616).

20720976 is an abundant number, since it is smaller than the sum of its proper divisors (35546256).

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

20720976 is a wasteful number, since it uses less digits than its factorization.

20720976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 20720976 is about 4552.0298768791. The cubic root of 20720976 is about 274.6650511525.

The spelling of 20720976 in words is "twenty million, seven hundred twenty thousand, nine hundred seventy-six".