20872544 has 96 divisors (see below), whose sum is σ = 52690176. Its totient is φ = 7902720.

The previous prime is 20872499. The next prime is 20872571. The reversal of 20872544 is 44527802.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 20872544.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105854 + ... + 106050.

It is an arithmetic number, because the mean of its divisors is an integer number (548856).

Almost surely, 2^20872544 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 20872544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26345088).

20872544 is an abundant number, since it is smaller than the sum of its proper divisors (31817632).

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

20872544 is a wasteful number, since it uses less digits than its factorization.

20872544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268 (or 260 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 20872544 is about 4568.6479400365. The cubic root of 20872544 is about 275.3331235777. Note that the first 3 decimals are identical.

The spelling of 20872544 in words is "twenty million, eight hundred seventy-two thousand, five hundred forty-four".