20890142 has 16 divisors (see below), whose sum is σ = 38566752. Its totient is φ = 8264160.

The previous prime is 20890099. The next prime is 20890183. The reversal of 20890142 is 24109802.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57209 + ... + 57572.

It is an arithmetic number, because the mean of its divisors is an integer number (2410422).

Almost surely, 2^20890142 is an apocalyptic number.

20890142 is a deficient number, since it is larger than the sum of its proper divisors (17676610).

20890142 is a wasteful number, since it uses less digits than its factorization.

20890142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114803.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 20890142 is about 4570.5734869926. The cubic root of 20890142 is about 275.4104812016.

Adding to 20890142 its reverse (24109802), we get a palindrome (44999944).

The spelling of 20890142 in words is "twenty million, eight hundred ninety thousand, one hundred forty-two".