20953873 has 2 divisors, whose sum is σ = 20953874. Its totient is φ = 20953872.

The previous prime is 20953871. The next prime is 20953879. The reversal of 20953873 is 37835902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15303744 + 5650129 = 3912^2 + 2377^2 .

It is a cyclic number.

It is not a de Polignac number, because 20953873 - 2¹ = 20953871 is a prime.

Together with 20953871, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20953871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10476936 + 10476937.

It is an arithmetic number, because the mean of its divisors is an integer number (10476937).

Almost surely, 2^20953873 is an apocalyptic number.

It is an amenable number.

20953873 is a deficient number, since it is larger than the sum of its proper divisors (1).

20953873 is an equidigital number, since it uses as much as digits as its factorization.

20953873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 20953873 is about 4577.5400599012. The cubic root of 20953873 is about 275.6902681357.

The spelling of 20953873 in words is "twenty million, nine hundred fifty-three thousand, eight hundred seventy-three".