20660142 has 16 divisors (see below), whose sum is σ = 42100560. Its totient is φ = 6756672.

The previous prime is 20660137. The next prime is 20660153. The reversal of 20660142 is 24106602.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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, 32167 + ... + 32802.

It is an arithmetic number, because the mean of its divisors is an integer number (2631285).

Almost surely, 2^20660142 is an apocalyptic number.

20660142 is an abundant number, since it is smaller than the sum of its proper divisors (21440418).

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

20660142 is a wasteful number, since it uses less digits than its factorization.

20660142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65027.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 20660142 is about 4545.3428913559. The cubic root of 20660142 is about 274.3959944535.

Adding to 20660142 its reverse (24106602), we get a palindrome (44766744).

It can be divided in two parts, 20660 and 142, that added together give a palindrome (20802).

The spelling of 20660142 in words is "twenty million, six hundred sixty thousand, one hundred forty-two".