20271216 has 40 divisors (see below), whose sum is σ = 59849344. Its totient is φ = 5791680.

The previous prime is 20271197. The next prime is 20271239. The reversal of 20271216 is 61217202.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 20271192 and 20271201.

It is a congruent number.

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, 29830 + ... + 30501.

Almost surely, 2^20271216 is an apocalyptic number.

It is an amenable number.

20271216 is an abundant number, since it is smaller than the sum of its proper divisors (39578128).

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

20271216 is a wasteful number, since it uses less digits than its factorization.

20271216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60349 (or 60343 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 20271216 is about 4502.3567162099. The cubic root of 20271216 is about 272.6632458992.

Adding to 20271216 its reverse (61217202), we get a palindrome (81488418).

The spelling of 20271216 in words is "twenty million, two hundred seventy-one thousand, two hundred sixteen".