20483981 has 4 divisors (see below), whose sum is σ = 23410272. Its totient is φ = 17557692.

The previous prime is 20483971. The next prime is 20483987. The reversal of 20483981 is 18938402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20483981 is a prime.

It is a super-2 number, since 2×20483981² = 839186955216722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20483987) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1463135 + ... + 1463148.

It is an arithmetic number, because the mean of its divisors is an integer number (5852568).

Almost surely, 2^20483981 is an apocalyptic number.

It is an amenable number.

20483981 is a deficient number, since it is larger than the sum of its proper divisors (2926291).

20483981 is an equidigital number, since it uses as much as digits as its factorization.

20483981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2926290.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 20483981 is about 4525.9232207363. The cubic root of 20483981 is about 273.6138779610.

The spelling of 20483981 in words is "twenty million, four hundred eighty-three thousand, nine hundred eighty-one".