20543216 has 20 divisors (see below), whose sum is σ = 40051752. Its totient is φ = 10207296.

The previous prime is 20543197. The next prime is 20543221. The reversal of 20543216 is 61234502.

It is a junction number, because it is equal to n+sod(n) for n = 20543191 and 20543200.

It is a congruent number.

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, 1331 + ... + 6546.

Almost surely, 2^20543216 is an apocalyptic number.

It is an amenable number.

20543216 is a deficient number, since it is larger than the sum of its proper divisors (19508536).

20543216 is a wasteful number, since it uses less digits than its factorization.

20543216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8048 (or 8042 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20543216 is about 4532.4624653713. The cubic root of 20543216 is about 273.8773671121.

Adding to 20543216 its reverse (61234502), we get a palindrome (81777718).

The spelling of 20543216 in words is "twenty million, five hundred forty-three thousand, two hundred sixteen".