20872672 has 48 divisors (see below), whose sum is σ = 43327872. Its totient is φ = 9884160.

The previous prime is 20872613. The next prime is 20872681. The reversal of 20872672 is 27627802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52378 + ... + 52774.

It is an arithmetic number, because the mean of its divisors is an integer number (902664).

Almost surely, 2^20872672 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 20872672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21663936).

20872672 is an abundant number, since it is smaller than the sum of its proper divisors (22455200).

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

20872672 is a wasteful number, since it uses less digits than its factorization.

20872672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 20872672 is about 4568.6619485359. The cubic root of 20872672 is about 275.3336863995. Note that the first 3 decimals are identical.

The spelling of 20872672 in words is "twenty million, eight hundred seventy-two thousand, six hundred seventy-two".