20878872 has 128 divisors (see below), whose sum is σ = 65126400. Its totient is φ = 5443200.

The previous prime is 20878849. The next prime is 20878877. The reversal of 20878872 is 27887802.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20878877) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98847 + ... + 99057.

It is an arithmetic number, because the mean of its divisors is an integer number (508800).

Almost surely, 2^20878872 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 20878872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32563200).

20878872 is an abundant number, since it is smaller than the sum of its proper divisors (44247528).

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

20878872 is a wasteful number, since it uses less digits than its factorization.

20878872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277 (or 273 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 42.

The square root of 20878872 is about 4569.3404338044. The cubic root of 20878872 is about 275.3609453255.

The spelling of 20878872 in words is "twenty million, eight hundred seventy-eight thousand, eight hundred seventy-two".