20163982 has 4 divisors (see below), whose sum is σ = 30245976. Its totient is φ = 10081990.

The previous prime is 20163931. The next prime is 20163991. The reversal of 20163982 is 28936102.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5040994 + ... + 5040997.

It is an arithmetic number, because the mean of its divisors is an integer number (7561494).

Almost surely, 2^20163982 is an apocalyptic number.

20163982 is a deficient number, since it is larger than the sum of its proper divisors (10081994).

20163982 is a wasteful number, since it uses less digits than its factorization.

20163982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10081993.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 20163982 is about 4490.4322731782. The cubic root of 20163982 is about 272.1816027011.

It can be divided in two parts, 2016398 and 2, that added together give a square (2016400 = 1420²).

The spelling of 20163982 in words is "twenty million, one hundred sixty-three thousand, nine hundred eighty-two".