20878144 has 56 divisors (see below), whose sum is σ = 49011840. Its totient is φ = 8633856.

The previous prime is 20878133. The next prime is 20878163. The reversal of 20878144 is 44187802.

It is a tau number, because it is divible by the number of its divisors (56).

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12189 + ... + 13795.

Almost surely, 2^20878144 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 20878144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24505920).

20878144 is an abundant number, since it is smaller than the sum of its proper divisors (28133696).

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

20878144 is a wasteful number, since it uses less digits than its factorization.

20878144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1655 (or 1645 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 20878144 is about 4569.2607717223. The cubic root of 20878144 is about 275.3577448796.

The spelling of 20878144 in words is "twenty million, eight hundred seventy-eight thousand, one hundred forty-four".