20711916 has 96 divisors (see below), whose sum is σ = 58968000. Its totient is φ = 6257664.

The previous prime is 20711909. The next prime is 20711941. The reversal of 20711916 is 61911702.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 20711916.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53050 + ... + 53438.

It is an arithmetic number, because the mean of its divisors is an integer number (614250).

Almost surely, 2^20711916 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 20711916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29484000).

20711916 is an abundant number, since it is smaller than the sum of its proper divisors (38256084).

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

20711916 is a wasteful number, since it uses less digits than its factorization.

20711916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448 (or 440 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

The square root of 20711916 is about 4551.0346076469. The cubic root of 20711916 is about 274.6250139758.

The spelling of 20711916 in words is "twenty million, seven hundred eleven thousand, nine hundred sixteen".