20684608 has 28 divisors (see below), whose sum is σ = 46910752. Its totient is φ = 8864640.

The previous prime is 20684581. The next prime is 20684611. The reversal of 20684608 is 80648602.

It is a tau number, because it is divible by the number of its divisors (28).

It is a super-2 number, since 2×20684608² = 855706016227328, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22638 + ... + 23533.

It is an arithmetic number, because the mean of its divisors is an integer number (1675384).

Almost surely, 2^20684608 is an apocalyptic number.

20684608 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20684608 is an abundant number, since it is smaller than the sum of its proper divisors (26226144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20684608 is an equidigital number, since it uses as much as digits as its factorization.

20684608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46190 (or 46180 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 20684608 is about 4548.0334211613. The cubic root of 20684608 is about 274.5042661217.

The spelling of 20684608 in words is "twenty million, six hundred eighty-four thousand, six hundred eight".