20684453 has 8 divisors (see below), whose sum is σ = 21530880. Its totient is φ = 19846960.

The previous prime is 20684449. The next prime is 20684473. The reversal of 20684453 is 35448602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20684453 - 2² = 20684449 is a prime.

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 (20684413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2708 + ... + 6978.

It is an arithmetic number, because the mean of its divisors is an integer number (2691360).

Almost surely, 2^20684453 is an apocalyptic number.

It is an amenable number.

20684453 is a deficient number, since it is larger than the sum of its proper divisors (846427).

20684453 is a wasteful number, since it uses less digits than its factorization.

20684453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4467.

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 20684453 is about 4548.0163807972. The cubic root of 20684453 is about 274.5035804546.

The spelling of 20684453 in words is "twenty million, six hundred eighty-four thousand, four hundred fifty-three".