20450142 has 48 divisors (see below), whose sum is σ = 46505472. Its totient is φ = 6486480.

The previous prime is 20450141. The next prime is 20450149. The reversal of 20450142 is 24105402.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20450141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37113 + ... + 37659.

It is an arithmetic number, because the mean of its divisors is an integer number (968864).

Almost surely, 2^20450142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20450142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23252736).

20450142 is an abundant number, since it is smaller than the sum of its proper divisors (26055330).

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

20450142 is a wasteful number, since it uses less digits than its factorization.

20450142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653 (or 650 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 20450142 is about 4522.1833222460. The cubic root of 20450142 is about 273.4631272656.

Adding to 20450142 its reverse (24105402), we get a palindrome (44555544).

The spelling of 20450142 in words is "twenty million, four hundred fifty thousand, one hundred forty-two".