20661982 has 8 divisors (see below), whose sum is σ = 33810552. Its totient is φ = 9391800.

The previous prime is 20661967. The next prime is 20661989. The reversal of 20661982 is 28916602.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20661989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 469569 + ... + 469612.

It is an arithmetic number, because the mean of its divisors is an integer number (4226319).

Almost surely, 2^20661982 is an apocalyptic number.

20661982 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20661982 is a deficient number, since it is larger than the sum of its proper divisors (13148570).

20661982 is a wasteful number, since it uses less digits than its factorization.

20661982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939194.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 20661982 is about 4545.5452918214. The cubic root of 20661982 is about 274.4041401484.

The spelling of 20661982 in words is "twenty million, six hundred sixty-one thousand, nine hundred eighty-two".