20813983 has 2 divisors, whose sum is σ = 20813984. Its totient is φ = 20813982.

The previous prime is 20813977. The next prime is 20814023. The reversal of 20813983 is 38931802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20813983 - 2¹³ = 20805791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20813953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10406991 + 10406992.

It is an arithmetic number, because the mean of its divisors is an integer number (10406992).

Almost surely, 2^20813983 is an apocalyptic number.

20813983 is a deficient number, since it is larger than the sum of its proper divisors (1).

20813983 is an equidigital number, since it uses as much as digits as its factorization.

20813983 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 20813983 is about 4562.2344306272. The cubic root of 20813983 is about 275.0753864947.

The spelling of 20813983 in words is "twenty million, eight hundred thirteen thousand, nine hundred eighty-three".