20047872 has 96 divisors (see below), whose sum is σ = 57788640. Its totient is φ = 6144000.

The previous prime is 20047871. The next prime is 20047889. The reversal of 20047872 is 27874002.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (20047871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79747 + ... + 79997.

It is an arithmetic number, because the mean of its divisors is an integer number (601965).

Almost surely, 2^20047872 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 20047872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28894320).

20047872 is an abundant number, since it is smaller than the sum of its proper divisors (37740768).

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

20047872 is a wasteful number, since it uses less digits than its factorization.

20047872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289 (or 269 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 20047872 is about 4477.4850083501. The cubic root of 20047872 is about 271.6581634250.

The spelling of 20047872 in words is "twenty million, forty-seven thousand, eight hundred seventy-two".