20009142 has 48 divisors (see below), whose sum is σ = 44815680. Its totient is φ = 6449136.

The previous prime is 20009137. The next prime is 20009173. The reversal of 20009142 is 24190002.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88033 + ... + 88259.

It is an arithmetic number, because the mean of its divisors is an integer number (933660).

Almost surely, 2^20009142 is an apocalyptic number.

20009142 is an abundant number, since it is smaller than the sum of its proper divisors (24806538).

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

20009142 is a wasteful number, since it uses less digits than its factorization.

20009142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377 (or 374 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 20009142 is about 4473.1579448975. The cubic root of 20009142 is about 271.4831140358.

Adding to 20009142 its reverse (24190002), we get a palindrome (44199144).

The spelling of 20009142 in words is "twenty million, nine thousand, one hundred forty-two".