20016816 has 20 divisors (see below), whose sum is σ = 51710232. Its totient is φ = 6672256.

The previous prime is 20016791. The next prime is 20016827. The reversal of 20016816 is 61861002.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 208461 + ... + 208556.

Almost surely, 2^20016816 is an apocalyptic number.

It is an amenable number.

20016816 is an abundant number, since it is smaller than the sum of its proper divisors (31693416).

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

20016816 is a wasteful number, since it uses less digits than its factorization.

20016816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417028 (or 417022 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 20016816 is about 4474.0156459270. The cubic root of 20016816 is about 271.5178164256.

Adding to 20016816 its reverse (61861002), we get a palindrome (81877818).

The spelling of 20016816 in words is "twenty million, sixteen thousand, eight hundred sixteen".