20720982 has 16 divisors (see below), whose sum is σ = 43623360. Its totient is φ = 6543432.

The previous prime is 20720971. The next prime is 20721013. The reversal of 20720982 is 28902702.

It is a congruent number.

It is an unprimeable number.

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, 90768 + ... + 90995.

It is an arithmetic number, because the mean of its divisors is an integer number (2726460).

Almost surely, 2^20720982 is an apocalyptic number.

20720982 is an abundant number, since it is smaller than the sum of its proper divisors (22902378).

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

20720982 is a wasteful number, since it uses less digits than its factorization.

20720982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181787.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 20720982 is about 4552.0305359257. The cubic root of 20720982 is about 274.6650776633.

The spelling of 20720982 in words is "twenty million, seven hundred twenty thousand, nine hundred eighty-two".