20102144 has 44 divisors (see below), whose sum is σ = 40923624. Its totient is φ = 9867264.

The previous prime is 20102129. The next prime is 20102153. The reversal of 20102144 is 44120102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68462 + ... + 68754.

Almost surely, 2^20102144 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 20102144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20461812).

20102144 is an abundant number, since it is smaller than the sum of its proper divisors (20821480).

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

20102144 is an equidigital number, since it uses as much as digits as its factorization.

20102144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380 (or 362 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 20102144 is about 4483.5414573750. The cubic root of 20102144 is about 271.9030796558.

Adding to 20102144 its reverse (44120102), we get a palindrome (64222246).

The spelling of 20102144 in words is "twenty million, one hundred two thousand, one hundred forty-four".