20979882 has 48 divisors (see below), whose sum is σ = 56676672. Its totient is φ = 5448960.

The previous prime is 20979877. The next prime is 20979899. The reversal of 20979882 is 28897902.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 6183 + ... + 8954.

It is an arithmetic number, because the mean of its divisors is an integer number (1180764).

Almost surely, 2^20979882 is an apocalyptic number.

20979882 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20979882 is an abundant number, since it is smaller than the sum of its proper divisors (35696790).

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

20979882 is a wasteful number, since it uses less digits than its factorization.

20979882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15163 (or 15160 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 20979882 is about 4580.3801152306. The cubic root of 20979882 is about 275.8042878440.

The spelling of 20979882 in words is "twenty million, nine hundred seventy-nine thousand, eight hundred eighty-two".