20439469 has 4 divisors (see below), whose sum is σ = 20450844. Its totient is φ = 20428096.

The previous prime is 20439449. The next prime is 20439481. The reversal of 20439469 is 96493402.

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 6563844 + 13875625 = 2562^2 + 3725^2 .

It is a cyclic number.

It is not a de Polignac number, because 20439469 - 2¹³ = 20431277 is a prime.

It is a super-2 number, since 2×20439469² = 835543786003922, 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 (20439439) 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, 2332 + ... + 6805.

It is an arithmetic number, because the mean of its divisors is an integer number (5112711).

Almost surely, 2^20439469 is an apocalyptic number.

It is an amenable number.

20439469 is a deficient number, since it is larger than the sum of its proper divisors (11375).

20439469 is an equidigital number, since it uses as much as digits as its factorization.

20439469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11374.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 20439469 is about 4521.0030966590. The cubic root of 20439469 is about 273.4155452022.

The spelling of 20439469 in words is "twenty million, four hundred thirty-nine thousand, four hundred sixty-nine".