20745469 has 4 divisors (see below), whose sum is σ = 21460860. Its totient is φ = 20030080.

The previous prime is 20745451. The next prime is 20745497. The reversal of 20745469 is 96454702.

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 16892100 + 3853369 = 4110^2 + 1963^2 .

It is a cyclic number.

It is not a de Polignac number, because 20745469 - 2⁷ = 20745341 is a prime.

It is a super-2 number, since 2×20745469² = 860748968059922, 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 (20745449) 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, 357652 + ... + 357709.

It is an arithmetic number, because the mean of its divisors is an integer number (5365215).

Almost surely, 2^20745469 is an apocalyptic number.

20745469 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20745469 is a deficient number, since it is larger than the sum of its proper divisors (715391).

20745469 is an equidigital number, since it uses as much as digits as its factorization.

20745469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715390.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 20745469 is about 4554.7194205571. The cubic root of 20745469 is about 274.7732301328.

The spelling of 20745469 in words is "twenty million, seven hundred forty-five thousand, four hundred sixty-nine".