20138530 has 32 divisors (see below), whose sum is σ = 37739520. Its totient is φ = 7728960.

The previous prime is 20138527. The next prime is 20138533. The reversal of 20138530 is 3583102.

It is an interprime number because it is at equal distance from previous prime (20138527) and next prime (20138533).

It is not an unprimeable number, because it can be changed into a prime (20138533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51576 + ... + 51964.

It is an arithmetic number, because the mean of its divisors is an integer number (1179360).

Almost surely, 2^20138530 is an apocalyptic number.

20138530 is a deficient number, since it is larger than the sum of its proper divisors (17600990).

20138530 is a wasteful number, since it uses less digits than its factorization.

20138530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20138530 is about 4487.5973527045. The cubic root of 20138530 is about 272.0670340117.

The spelling of 20138530 in words is "twenty million, one hundred thirty-eight thousand, five hundred thirty".