20142890 has 32 divisors (see below), whose sum is σ = 37706256. Its totient is φ = 7741440.

The previous prime is 20142887. The next prime is 20142919. The reversal of 20142890 is 9824102.

It can be written as a sum of positive squares in 8 ways, for example, as 2745649 + 17397241 = 1657^2 + 4171^2 .

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 15 ways as a sum of consecutive naturals, for example, 29594 + ... + 30266.

Almost surely, 2^20142890 is an apocalyptic number.

20142890 is a deficient number, since it is larger than the sum of its proper divisors (17563366).

20142890 is a wasteful number, since it uses less digits than its factorization.

20142890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794.

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

The square root of 20142890 is about 4488.0831097474. The cubic root of 20142890 is about 272.0866668030.

Adding to 20142890 its reverse (9824102), we get a palindrome (29966992).

The spelling of 20142890 in words is "twenty million, one hundred forty-two thousand, eight hundred ninety".