20706816 has 160 divisors (see below), whose sum is σ = 63933408. Its totient is φ = 5898240.

The previous prime is 20706809. The next prime is 20706821. The reversal of 20706816 is 61860702.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 339426 + ... + 339486.

Almost surely, 2^20706816 is an apocalyptic number.

20706816 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20706816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31966704).

20706816 is an abundant number, since it is smaller than the sum of its proper divisors (43226592).

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

20706816 is a wasteful number, since it uses less digits than its factorization.

20706816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112 (or 96 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 20706816 is about 4550.4742609974. The cubic root of 20706816 is about 274.6024713559.

The spelling of 20706816 in words is "twenty million, seven hundred six thousand, eight hundred sixteen".