20100216 has 16 divisors (see below), whose sum is σ = 50250600. Its totient is φ = 6700064.

The previous prime is 20100203. The next prime is 20100217. The reversal of 20100216 is 61200102.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 418731 + ... + 418778.

Almost surely, 2^20100216 is an apocalyptic number.

It is an amenable number.

20100216 is an abundant number, since it is smaller than the sum of its proper divisors (30150384).

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

20100216 is a wasteful number, since it uses less digits than its factorization.

20100216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837518 (or 837514 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 20100216 is about 4483.3264436130. The cubic root of 20100216 is about 271.8943866213.

Adding to 20100216 its reverse (61200102), we get a palindrome (81300318).

The spelling of 20100216 in words is "twenty million, one hundred thousand, two hundred sixteen".