20413983 has 4 divisors (see below), whose sum is σ = 27218648. Its totient is φ = 13609320.

The previous prime is 20413979. The next prime is 20413997. The reversal of 20413983 is 38931402.

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

It is not a de Polignac number, because 20413983 - 2² = 20413979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20413983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20413963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3402328 + ... + 3402333.

It is an arithmetic number, because the mean of its divisors is an integer number (6804662).

Almost surely, 2^20413983 is an apocalyptic number.

20413983 is a deficient number, since it is larger than the sum of its proper divisors (6804665).

20413983 is an equidigital number, since it uses as much as digits as its factorization.

20413983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6804664.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 20413983 is about 4518.1835952073. The cubic root of 20413983 is about 273.3018572057.

The spelling of 20413983 in words is "twenty million, four hundred thirteen thousand, nine hundred eighty-three".