20243916 has 144 divisors (see below), whose sum is σ = 65345280. Its totient is φ = 5132160.

The previous prime is 20243891. The next prime is 20243939. The reversal of 20243916 is 61934202.

It is a super-2 number, since 2×20243916² = 819632270030112, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20243916.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 185670 + ... + 185778.

Almost surely, 2^20243916 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 20243916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32672640).

20243916 is an abundant number, since it is smaller than the sum of its proper divisors (45101364).

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

20243916 is a wasteful number, since it uses less digits than its factorization.

20243916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 20243916 is about 4499.3239492173. The cubic root of 20243916 is about 272.5407890013.

The spelling of 20243916 in words is "twenty million, two hundred forty-three thousand, nine hundred sixteen".