20808624 has 20 divisors (see below), whose sum is σ = 53755736. Its totient is φ = 6936192.

The previous prime is 20808617. The next prime is 20808637. The reversal of 20808624 is 42680802.

It is a happy number.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20808591 and 20808600.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216709 + ... + 216804.

Almost surely, 2^20808624 is an apocalyptic number.

20808624 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20808624 is an abundant number, since it is smaller than the sum of its proper divisors (32947112).

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

20808624 is a wasteful number, since it uses less digits than its factorization.

20808624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433524 (or 433518 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 20808624 is about 4561.6470709602. The cubic root of 20808624 is about 275.0517764769.

The spelling of 20808624 in words is "twenty million, eight hundred eight thousand, six hundred twenty-four".