20523203 has 2 divisors, whose sum is σ = 20523204. Its totient is φ = 20523202.

The previous prime is 20523193. The next prime is 20523221. The reversal of 20523203 is 30232502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20523203 - 2⁴ = 20523187 is a prime.

It is a super-2 number, since 2×20523203² = 842403722758418, which contains 22 as substring.

It is a Sophie Germain prime.

It is equal to p_1301651 and since 20523203 and 1301651 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20523253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10261601 + 10261602.

It is an arithmetic number, because the mean of its divisors is an integer number (10261602).

Almost surely, 2^20523203 is an apocalyptic number.

20523203 is a deficient number, since it is larger than the sum of its proper divisors (1).

20523203 is an equidigital number, since it uses as much as digits as its factorization.

20523203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 17.

The square root of 20523203 is about 4530.2541871290. The cubic root of 20523203 is about 273.7884019992.

Adding to 20523203 its reverse (30232502), we get a palindrome (50755705).

The spelling of 20523203 in words is "twenty million, five hundred twenty-three thousand, two hundred three".