20647650 has 48 divisors (see below), whose sum is σ = 51559200. Its totient is φ = 5468160.

The previous prime is 20647631. The next prime is 20647651. The reversal of 20647650 is 5674602.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (20647651) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 26466 + ... + 27234.

It is an arithmetic number, because the mean of its divisors is an integer number (1074150).

Almost surely, 2^20647650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20647650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25779600).

20647650 is an abundant number, since it is smaller than the sum of its proper divisors (30911550).

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

20647650 is a wasteful number, since it uses less digits than its factorization.

20647650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963 (or 958 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 20647650 is about 4543.9685298206. The cubic root of 20647650 is about 274.3406794763.

The spelling of 20647650 in words is "twenty million, six hundred forty-seven thousand, six hundred fifty".