20686453 has 8 divisors (see below), whose sum is σ = 21643776. Its totient is φ = 19734000.

The previous prime is 20686447. The next prime is 20686513. The reversal of 20686453 is 35468602.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-20686453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20686553) 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, 9628 + ... + 11578.

It is an arithmetic number, because the mean of its divisors is an integer number (2705472).

Almost surely, 2^20686453 is an apocalyptic number.

20686453 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20686453 is a deficient number, since it is larger than the sum of its proper divisors (957323).

20686453 is a wasteful number, since it uses less digits than its factorization.

20686453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2435.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 20686453 is about 4548.2362515595. The cubic root of 20686453 is about 274.5124275094.

The spelling of 20686453 in words is "twenty million, six hundred eighty-six thousand, four hundred fifty-three".