20243872 has 72 divisors (see below), whose sum is σ = 46418400. Its totient is φ = 8616960.

The previous prime is 20243863. The next prime is 20243879. The reversal of 20243872 is 27834202.

It is a self number, because there is not a number n which added to its sum of digits gives 20243872.

It is not an unprimeable number, because it can be changed into a prime (20243879) 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, 101629 + ... + 101827.

It is an arithmetic number, because the mean of its divisors is an integer number (644700).

Almost surely, 2^20243872 is an apocalyptic number.

20243872 is a gapful number since it is divisible by the number (22) 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 20243872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23209200).

20243872 is an abundant number, since it is smaller than the sum of its proper divisors (26174528).

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

20243872 is a wasteful number, since it uses less digits than its factorization.

20243872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254 (or 229 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 20243872 is about 4499.3190595911. The cubic root of 20243872 is about 272.5405915460.

It can be divided in two parts, 20243 and 872, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 20243872 in words is "twenty million, two hundred forty-three thousand, eight hundred seventy-two".