20641469 has 4 divisors (see below), whose sum is σ = 20722044. Its totient is φ = 20560896.

The previous prime is 20641459. The next prime is 20641483. The reversal of 20641469 is 96414602.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11868025 + 8773444 = 3445^2 + 2962^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20641469 is a prime.

It is a super-2 number, since 2×20641469² = 852140484955922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20641459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39902 + ... + 40415.

It is an arithmetic number, because the mean of its divisors is an integer number (5180511).

Almost surely, 2^20641469 is an apocalyptic number.

It is an amenable number.

20641469 is a deficient number, since it is larger than the sum of its proper divisors (80575).

20641469 is an equidigital number, since it uses as much as digits as its factorization.

20641469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80574.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 20641469 is about 4543.2883465613. The cubic root of 20641469 is about 274.3133015588.

The spelling of 20641469 in words is "twenty million, six hundred forty-one thousand, four hundred sixty-nine".