20686253 has 8 divisors (see below), whose sum is σ = 23678208. Its totient is φ = 17703504.

The previous prime is 20686247. The next prime is 20686261. The reversal of 20686253 is 35268602.

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

It is not a de Polignac number, because 20686253 - 2⁶ = 20686189 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, 3500 + ... + 7322.

It is an arithmetic number, because the mean of its divisors is an integer number (2959776).

Almost surely, 2^20686253 is an apocalyptic number.

It is an amenable number.

20686253 is a deficient number, since it is larger than the sum of its proper divisors (2991955).

20686253 is an equidigital number, since it uses as much as digits as its factorization.

20686253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4603.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 20686253 is about 4548.2142649616. The cubic root of 20686253 is about 274.5115428296.

The spelling of 20686253 in words is "twenty million, six hundred eighty-six thousand, two hundred fifty-three".