20178144 has 72 divisors (see below), whose sum is σ = 65585520. Its totient is φ = 5764608.

The previous prime is 20178143. The next prime is 20178157. The reversal of 20178144 is 44187102.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20178143) 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, 2989 + ... + 7020.

It is an arithmetic number, because the mean of its divisors is an integer number (910910).

Almost surely, 2^20178144 is an apocalyptic number.

20178144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20178144 is an abundant number, since it is smaller than the sum of its proper divisors (45407376).

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

20178144 is a wasteful number, since it uses less digits than its factorization.

20178144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10032 (or 10021 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 20178144 is about 4492.0089047107. The cubic root of 20178144 is about 272.2453092610.

The spelling of 20178144 in words is "twenty million, one hundred seventy-eight thousand, one hundred forty-four".