20684395 has 12 divisors (see below), whose sum is σ = 25711920. Its totient is φ = 15973664.

The previous prime is 20684387. The next prime is 20684413. The reversal of 20684395 is 59348602.

It is not a de Polignac number, because 20684395 - 2³ = 20684387 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1746 + ... + 6664.

It is an arithmetic number, because the mean of its divisors is an integer number (2142660).

Almost surely, 2^20684395 is an apocalyptic number.

20684395 is a deficient number, since it is larger than the sum of its proper divisors (5027525).

20684395 is an equidigital number, since it uses as much as digits as its factorization.

20684395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4982 (or 4953 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 20684395 is about 4548.0100043865. The cubic root of 20684395 is about 274.5033238815.

The spelling of 20684395 in words is "twenty million, six hundred eighty-four thousand, three hundred ninety-five".