20878512 has 60 divisors (see below), whose sum is σ = 55793304. Its totient is φ = 6723840.

The previous prime is 20878477. The next prime is 20878513. The reversal of 20878512 is 21587802.

It is not an unprimeable number, because it can be changed into a prime (20878513) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 202653 + ... + 202755.

Almost surely, 2^20878512 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 20878512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27896652).

20878512 is an abundant number, since it is smaller than the sum of its proper divisors (34914792).

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

20878512 is a wasteful number, since it uses less digits than its factorization.

20878512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 20878512 is about 4569.3010406407. The cubic root of 20878512 is about 275.3593626967.

The spelling of 20878512 in words is "twenty million, eight hundred seventy-eight thousand, five hundred twelve".