20657104 has 40 divisors (see below), whose sum is σ = 45379040. Its totient is φ = 9030528.

The previous prime is 20657093. The next prime is 20657107. The reversal of 20657104 is 40175602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20657107) 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 7 ways as a sum of consecutive naturals, for example, 1339 + ... + 6565.

It is an arithmetic number, because the mean of its divisors is an integer number (1134476).

Almost surely, 2^20657104 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 20657104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22689520).

20657104 is an abundant number, since it is smaller than the sum of its proper divisors (24721936).

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

20657104 is a wasteful number, since it uses less digits than its factorization.

20657104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5267 (or 5261 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 20657104 is about 4545.0086908608. The cubic root of 20657104 is about 274.3825441442.

The spelling of 20657104 in words is "twenty million, six hundred fifty-seven thousand, one hundred four".