20951233 has 2 divisors, whose sum is σ = 20951234. Its totient is φ = 20951232.

The previous prime is 20951209. The next prime is 20951239. The reversal of 20951233 is 33215902.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20948929 + 2304 = 4577^2 + 48^2 .

It is a cyclic number.

It is not a de Polignac number, because 20951233 - 2⁵ = 20951201 is a prime.

It is equal to p_1327048 and since 20951233 and 1327048 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 20951198 and 20951207.

It is not a weakly prime, because it can be changed into another prime (20951239) 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 as a sum of consecutive naturals, namely, 10475616 + 10475617.

It is an arithmetic number, because the mean of its divisors is an integer number (10475617).

Almost surely, 2^20951233 is an apocalyptic number.

It is an amenable number.

20951233 is a deficient number, since it is larger than the sum of its proper divisors (1).

20951233 is an equidigital number, since it uses as much as digits as its factorization.

20951233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 20951233 is about 4577.2516863288. The cubic root of 20951233 is about 275.6786894826.

The spelling of 20951233 in words is "twenty million, nine hundred fifty-one thousand, two hundred thirty-three".