20684607 has 4 divisors (see below), whose sum is σ = 27579480. Its totient is φ = 13789736.

The previous prime is 20684581. The next prime is 20684611. The reversal of 20684607 is 70648602.

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 20684607 - 2⁷ = 20684479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20684647) 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, 3447432 + ... + 3447437.

It is an arithmetic number, because the mean of its divisors is an integer number (6894870).

Almost surely, 2^20684607 is an apocalyptic number.

20684607 is a deficient number, since it is larger than the sum of its proper divisors (6894873).

20684607 is an equidigital number, since it uses as much as digits as its factorization.

20684607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6894872.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 20684607 is about 4548.0333112237. The cubic root of 20684607 is about 274.5042616981.

The spelling of 20684607 in words is "twenty million, six hundred eighty-four thousand, six hundred seven".