20139030 has 120 divisors (see below), whose sum is σ = 57812832. Its totient is φ = 5027616.

The previous prime is 20139019. The next prime is 20139109. The reversal of 20139030 is 3093102.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20138994 and 20139012.

It is a congruent number.

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 59 ways as a sum of consecutive naturals, for example, 428467 + ... + 428513.

Almost surely, 2^20139030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20139030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28906416).

20139030 is an abundant number, since it is smaller than the sum of its proper divisors (37673802).

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

20139030 is a wasteful number, since it uses less digits than its factorization.

20139030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112 (or 80 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 20139030 is about 4487.6530614565. The cubic root of 20139030 is about 272.0692856224.

The spelling of 20139030 in words is "twenty million, one hundred thirty-nine thousand, thirty".