20453569 has 4 divisors (see below), whose sum is σ = 20463444. Its totient is φ = 20443696.

The previous prime is 20453551. The next prime is 20453579. The reversal of 20453569 is 96535402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 8294400 + 12159169 = 2880^2 + 3487^2 .

It is a cyclic number.

It is not a de Polignac number, because 20453569 - 2¹¹ = 20451521 is a prime.

It is a super-2 number, since 2×20453569² = 836696969675522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20453539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 502 + ... + 6415.

It is an arithmetic number, because the mean of its divisors is an integer number (5115861).

Almost surely, 2^20453569 is an apocalyptic number.

It is an amenable number.

20453569 is a deficient number, since it is larger than the sum of its proper divisors (9875).

20453569 is an equidigital number, since it uses as much as digits as its factorization.

20453569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9874.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 20453569 is about 4522.5622162664. The cubic root of 20453569 is about 273.4784019075.

The spelling of 20453569 in words is "twenty million, four hundred fifty-three thousand, five hundred sixty-nine".