20819016 has 96 divisors (see below), whose sum is σ = 60779160. Its totient is φ = 6414336.

The previous prime is 20818997. The next prime is 20819017. The reversal of 20819016 is 61091802.

It can be written as a sum of positive squares in 4 ways, for example, as 18096516 + 2722500 = 4254^2 + 1650^2 .

It is not an unprimeable number, because it can be changed into a prime (20819017) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89236 + ... + 89468.

Almost surely, 2^20819016 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20819016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30389580).

20819016 is an abundant number, since it is smaller than the sum of its proper divisors (39960144).

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

20819016 is a wasteful number, since it uses less digits than its factorization.

20819016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335 (or 328 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 20819016 is about 4562.7859910366. The cubic root of 20819016 is about 275.0975565722.

The spelling of 20819016 in words is "twenty million, eight hundred nineteen thousand, sixteen".