20812983 has 4 divisors (see below), whose sum is σ = 27750648. Its totient is φ = 13875320.

The previous prime is 20812973. The next prime is 20812993. The reversal of 20812983 is 38921802.

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

It is an interprime number because it is at equal distance from previous prime (20812973) and next prime (20812993).

It is a cyclic number.

It is not a de Polignac number, because 20812983 - 2²¹ = 18715831 is a prime.

It is a super-2 number, since 2×20812983² = 866360522716578, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20812933) 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, 3468828 + ... + 3468833.

It is an arithmetic number, because the mean of its divisors is an integer number (6937662).

Almost surely, 2^20812983 is an apocalyptic number.

20812983 is a deficient number, since it is larger than the sum of its proper divisors (6937665).

20812983 is an equidigital number, since it uses as much as digits as its factorization.

20812983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6937664.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 20812983 is about 4562.1248338905. The cubic root of 20812983 is about 275.0709811263.

The spelling of 20812983 in words is "twenty million, eight hundred twelve thousand, nine hundred eighty-three".