20766216 has 16 divisors (see below), whose sum is σ = 51915600. Its totient is φ = 6922064.

The previous prime is 20766211. The next prime is 20766241. The reversal of 20766216 is 61266702.

It is not an unprimeable number, because it can be changed into a prime (20766211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 432606 + ... + 432653.

It is an arithmetic number, because the mean of its divisors is an integer number (3244725).

Almost surely, 2^20766216 is an apocalyptic number.

It is an amenable number.

20766216 is an abundant number, since it is smaller than the sum of its proper divisors (31149384).

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

20766216 is a wasteful number, since it uses less digits than its factorization.

20766216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865268 (or 865264 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 20766216 is about 4556.9963791954. The cubic root of 20766216 is about 274.8647974510.

The spelling of 20766216 in words is "twenty million, seven hundred sixty-six thousand, two hundred sixteen".