20556024 has 64 divisors (see below), whose sum is σ = 55056000. Its totient is φ = 6376320.

The previous prime is 20556023. The next prime is 20556031. The reversal of 20556024 is 42065502.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 20555985 and 20556003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20556023) 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, 27447 + ... + 28185.

It is an arithmetic number, because the mean of its divisors is an integer number (860250).

Almost surely, 2^20556024 is an apocalyptic number.

20556024 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 20556024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27528000).

20556024 is an abundant number, since it is smaller than the sum of its proper divisors (34499976).

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

20556024 is a wasteful number, since it uses less digits than its factorization.

20556024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828 (or 824 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 20556024 is about 4533.8751636983. The cubic root of 20556024 is about 273.9342730443.

The spelling of 20556024 in words is "twenty million, five hundred fifty-six thousand, twenty-four".