20343216 has 40 divisors (see below), whose sum is σ = 53840304. Its totient is φ = 6615040.

The previous prime is 20343209. The next prime is 20343227. The reversal of 20343216 is 61234302.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20343192 and 20343201.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3201 + ... + 7136.

Almost surely, 2^20343216 is an apocalyptic number.

It is an amenable number.

20343216 is an abundant number, since it is smaller than the sum of its proper divisors (33497088).

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

20343216 is a wasteful number, since it uses less digits than its factorization.

20343216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10389 (or 10383 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 20343216 is about 4510.3454413160. The cubic root of 20343216 is about 272.9856826744.

Adding to 20343216 its reverse (61234302), we get a palindrome (81577518).

The spelling of 20343216 in words is "twenty million, three hundred forty-three thousand, two hundred sixteen".