20139282 has 48 divisors (see below), whose sum is σ = 46289880. Its totient is φ = 6316800.

The previous prime is 20139277. The next prime is 20139307. The reversal of 20139282 is 28293102.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13682601 + 6456681 = 3699^2 + 2541^2 .

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, 20932 + ... + 21872.

Almost surely, 2^20139282 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20139282, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23144940).

20139282 is an abundant number, since it is smaller than the sum of its proper divisors (26150598).

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

20139282 is a wasteful number, since it uses less digits than its factorization.

20139282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019 (or 1016 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20139282 is about 4487.6811384054. The cubic root of 20139282 is about 272.0704204201.

The spelling of 20139282 in words is "twenty million, one hundred thirty-nine thousand, two hundred eighty-two".