20708469 has 18 divisors (see below), whose sum is σ = 30473846. Its totient is φ = 13551120.

The previous prime is 20708453. The next prime is 20708473. The reversal of 20708469 is 96480702.

It can be written as a sum of positive squares in only one way, i.e., 19580625 + 1127844 = 4425^2 + 1062^2 .

It is not a de Polignac number, because 20708469 - 2⁴ = 20708453 is a prime.

It is a super-2 number, since 2×20708469² = 857681376647922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20708489) 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 17 ways as a sum of consecutive naturals, for example, 30999 + ... + 31659.

Almost surely, 2^20708469 is an apocalyptic number.

It is an amenable number.

20708469 is a deficient number, since it is larger than the sum of its proper divisors (9765377).

20708469 is an equidigital number, since it uses as much as digits as its factorization.

20708469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785 (or 723 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 20708469 is about 4550.6558867926. The cubic root of 20708469 is about 274.6097782222.

The spelling of 20708469 in words is "twenty million, seven hundred eight thousand, four hundred sixty-nine".