20543808 has 56 divisors (see below), whose sum is σ = 55201312. Its totient is φ = 6741504.

The previous prime is 20543801. The next prime is 20543827. The reversal of 20543808 is 80834502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20543801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12066 + ... + 13662.

Almost surely, 2^20543808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20543808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27600656).

20543808 is an abundant number, since it is smaller than the sum of its proper divisors (34657504).

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

20543808 is a wasteful number, since it uses less digits than its factorization.

20543808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1679 (or 1669 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 20543808 is about 4532.5277715641. The cubic root of 20543808 is about 273.8799978889.

The spelling of 20543808 in words is "twenty million, five hundred forty-three thousand, eight hundred eight".