20685419 has 4 divisors (see below), whose sum is σ = 20801160. Its totient is φ = 20569680.

The previous prime is 20685407. The next prime is 20685421. The reversal of 20685419 is 91458602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20685419 - 2⁴ = 20685403 is a prime.

It is a super-2 number, since 2×20685419² = 855773118411122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20685449) 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, 57602 + ... + 57959.

It is an arithmetic number, because the mean of its divisors is an integer number (5200290).

Almost surely, 2^20685419 is an apocalyptic number.

20685419 is a deficient number, since it is larger than the sum of its proper divisors (115741).

20685419 is a wasteful number, since it uses less digits than its factorization.

20685419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115740.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 20685419 is about 4548.1225797025. The cubic root of 20685419 is about 274.5078536532.

The spelling of 20685419 in words is "twenty million, six hundred eighty-five thousand, four hundred nineteen".