20381142 has 16 divisors (see below), whose sum is σ = 42168240. Its totient is φ = 6559392.

The previous prime is 20381107. The next prime is 20381149. The reversal of 20381142 is 24118302.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58393 + ... + 58740.

It is an arithmetic number, because the mean of its divisors is an integer number (2635515).

Almost surely, 2^20381142 is an apocalyptic number.

20381142 is an abundant number, since it is smaller than the sum of its proper divisors (21787098).

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

20381142 is a wasteful number, since it uses less digits than its factorization.

20381142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117167.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 20381142 is about 4514.5478178883. The cubic root of 20381142 is about 273.1552204010.

Adding to 20381142 its reverse (24118302), we get a palindrome (44499444).

The spelling of 20381142 in words is "twenty million, three hundred eighty-one thousand, one hundred forty-two".