20613606 has 48 divisors (see below), whose sum is σ = 46247760. Its totient is φ = 6115200.

The previous prime is 20613601. The next prime is 20613647. The reversal of 20613606 is 60631602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20613601) 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, 29056 + ... + 29756.

It is an arithmetic number, because the mean of its divisors is an integer number (963495).

Almost surely, 2^20613606 is an apocalyptic number.

20613606 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20613606, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23123880).

20613606 is an abundant number, since it is smaller than the sum of its proper divisors (25634154).

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

20613606 is a wasteful number, since it uses less digits than its factorization.

20613606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761 (or 748 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 20613606 is about 4540.2209197351. The cubic root of 20613606 is about 274.1898182096.

The spelling of 20613606 in words is "twenty million, six hundred thirteen thousand, six hundred six".