20381144 has 16 divisors (see below), whose sum is σ = 43674000. Its totient is φ = 8734752.

The previous prime is 20381107. The next prime is 20381149. The reversal of 20381144 is 44118302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20381149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181919 + ... + 182030.

It is an arithmetic number, because the mean of its divisors is an integer number (2729625).

Almost surely, 2^20381144 is an apocalyptic number.

It is an amenable number.

20381144 is an abundant number, since it is smaller than the sum of its proper divisors (23292856).

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

20381144 is a wasteful number, since it uses less digits than its factorization.

20381144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363962 (or 363958 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 20381144 is about 4514.5480393944. The cubic root of 20381144 is about 273.1552293359.

Adding to 20381144 its reverse (44118302), we get a palindrome (64499446).

The spelling of 20381144 in words is "twenty million, three hundred eighty-one thousand, one hundred forty-four".