20408142 has 8 divisors (see below), whose sum is σ = 40816296. Its totient is φ = 6802712.

The previous prime is 20408117. The next prime is 20408189. The reversal of 20408142 is 24180402.

It is a sphenic number, since it is the product of 3 distinct primes.

20408142 is an admirable number.

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, 1700673 + ... + 1700684.

It is an arithmetic number, because the mean of its divisors is an integer number (5102037).

Almost surely, 2^20408142 is an apocalyptic number.

20408142 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20408142 is a wasteful number, since it uses less digits than its factorization.

20408142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3401362.

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 20408142 is about 4517.5371608876. The cubic root of 20408142 is about 273.2757883353.

Adding to 20408142 its reverse (24180402), we get a palindrome (44588544).

The spelling of 20408142 in words is "twenty million, four hundred eight thousand, one hundred forty-two".