20556744 has 64 divisors (see below), whose sum is σ = 56730240. Its totient is φ = 6167040.

The previous prime is 20556743. The next prime is 20556769. The reversal of 20556744 is 44765502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20556743) 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 15 ways as a sum of consecutive naturals, for example, 11989 + ... + 13595.

It is an arithmetic number, because the mean of its divisors is an integer number (886410).

Almost surely, 2^20556744 is an apocalyptic number.

20556744 is a gapful number since it is divisible by the number (24) 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 20556744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28365120).

20556744 is an abundant number, since it is smaller than the sum of its proper divisors (36173496).

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

20556744 is a wasteful number, since it uses less digits than its factorization.

20556744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1670 (or 1666 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 33.

The square root of 20556744 is about 4533.9545652774. The cubic root of 20556744 is about 273.9374713018.

The spelling of 20556744 in words is "twenty million, five hundred fifty-six thousand, seven hundred forty-four".