20913600 has 84 divisors (see below), whose sum is σ = 68629784. Its totient is φ = 5575680.

The previous prime is 20913569. The next prime is 20913617. The reversal of 20913600 is 631902.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 2622 + ... + 6978.

Almost surely, 2^20913600 is an apocalyptic number.

20913600 is a gapful number since it is divisible by the number (20) 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 20913600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34314892).

20913600 is an abundant number, since it is smaller than the sum of its proper divisors (47716184).

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

20913600 is a wasteful number, since it uses less digits than its factorization.

20913600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4382 (or 4367 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 20913600 is about 4573.1389657433. The cubic root of 20913600 is about 275.5135308016.

The spelling of 20913600 in words is "twenty million, nine hundred thirteen thousand, six hundred".