20030138 has 4 divisors (see below), whose sum is σ = 30045210. Its totient is φ = 10015068.

The previous prime is 20030137. The next prime is 20030159. The reversal of 20030138 is 83103002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15264649 + 4765489 = 3907^2 + 2183^2 .

It is not an unprimeable number, because it can be changed into a prime (20030137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5007533 + ... + 5007536.

Almost surely, 2^20030138 is an apocalyptic number.

20030138 is a deficient number, since it is larger than the sum of its proper divisors (10015072).

20030138 is a wasteful number, since it uses less digits than its factorization.

20030138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10015071.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 20030138 is about 4475.5042174039. The cubic root of 20030138 is about 271.5780384275.

The spelling of 20030138 in words is "twenty million, thirty thousand, one hundred thirty-eight".