20841656 has 48 divisors (see below), whose sum is σ = 44067240. Its totient is φ = 9164160.

The previous prime is 20841649. The next prime is 20841659. The reversal of 20841656 is 65614802.

20841656 = T₃₉₆ + T₃₉₇ + ... + T₅₇₁.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20841659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120386 + ... + 120558.

Almost surely, 2^20841656 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 20841656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22033620).

20841656 is an abundant number, since it is smaller than the sum of its proper divisors (23225584).

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

20841656 is a wasteful number, since it uses less digits than its factorization.

20841656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264 (or 223 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 20841656 is about 4565.2662572954. The cubic root of 20841656 is about 275.1972403162.

The spelling of 20841656 in words is "twenty million, eight hundred forty-one thousand, six hundred fifty-six".