20433481 has 2 divisors, whose sum is σ = 20433482.
Its totient is φ = 20433480.
The previous prime is 20433463. The next prime is 20433533. The reversal of 20433481 is 18433402.
Adding to 20433481 its reverse (18433402), we get a palindrome (38866883).
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 20331081 + 102400 = 4509^2 + 320^2
It is a cyclic number.
It is not a de Polignac number, because 20433481 - 29 = 20432969 is a prime.
It is a super-2 number, since 2×204334812 = 835054291554722, which contains 22 as substring.
It is equal to p1296322 and since 20433481 and 1296322 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 (20433181) 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, 10216740 + 10216741.
It is an arithmetic number, because the mean of its divisors is an integer number (10216741).
Almost surely, 220433481 is an apocalyptic number.
It is an amenable number.
20433481 is a deficient number, since it is larger than the sum of its proper divisors (1).
20433481 is an equidigital number, since it uses as much as digits as its factorization.
20433481 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 2304, while the sum is 25.
The square root of 20433481 is about 4520.3408057358.
The cubic root of 20433481 is about 273.3888424179.
The spelling of 20433481 in words is "twenty million, four hundred thirty-three thousand, four hundred eighty-one".