20342983 has 4 divisors (see below), whose sum is σ = 20621728. Its totient is φ = 20064240.

The previous prime is 20342981. The next prime is 20343019. The reversal of 20342983 is 38924302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38924302 = 2 ⋅19462151.

It is a cyclic number.

It is not a de Polignac number, because 20342983 - 2¹ = 20342981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20342981) 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, 139263 + ... + 139408.

It is an arithmetic number, because the mean of its divisors is an integer number (5155432).

Almost surely, 2^20342983 is an apocalyptic number.

20342983 is a deficient number, since it is larger than the sum of its proper divisors (278745).

20342983 is an equidigital number, since it uses as much as digits as its factorization.

20342983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278744.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 20342983 is about 4510.3196117348. The cubic root of 20342983 is about 272.9846404612.

The spelling of 20342983 in words is "twenty million, three hundred forty-two thousand, nine hundred eighty-three".