20769216 has 112 divisors (see below), whose sum is σ = 60679584. Its totient is φ = 6230016.

The previous prime is 20769211. The next prime is 20769233. The reversal of 20769216 is 61296702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20769211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132210 + ... + 132366.

It is an arithmetic number, because the mean of its divisors is an integer number (541782).

Almost surely, 2^20769216 is an apocalyptic number.

20769216 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 20769216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30339792).

20769216 is an abundant number, since it is smaller than the sum of its proper divisors (39910368).

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

20769216 is a wasteful number, since it uses less digits than its factorization.

20769216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238 (or 228 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 20769216 is about 4557.3255314932. The cubic root of 20769216 is about 274.8780329659.

The spelling of 20769216 in words is "twenty million, seven hundred sixty-nine thousand, two hundred sixteen".