20983723 has 2 divisors, whose sum is σ = 20983724. Its totient is φ = 20983722.

The previous prime is 20983709. The next prime is 20983727. The reversal of 20983723 is 32738902.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20983723 is a prime.

It is not a weakly prime, because it can be changed into another prime (20983727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10491861 + 10491862.

It is an arithmetic number, because the mean of its divisors is an integer number (10491862).

Almost surely, 2^20983723 is an apocalyptic number.

20983723 is a deficient number, since it is larger than the sum of its proper divisors (1).

20983723 is an equidigital number, since it uses as much as digits as its factorization.

20983723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 20983723 is about 4580.7993843870. The cubic root of 20983723 is about 275.8211182473.

The spelling of 20983723 in words is "twenty million, nine hundred eighty-three thousand, seven hundred twenty-three".