20380530 has 32 divisors (see below), whose sum is σ = 51041664. Its totient is φ = 5198336.

The previous prime is 20380489. The next prime is 20380537. The reversal of 20380530 is 3508302.

It is a junction number, because it is equal to n+sod(n) for n = 20380497 and 20380506.

It is not an unprimeable number, because it can be changed into a prime (20380537) 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, 14079 + ... + 15458.

It is an arithmetic number, because the mean of its divisors is an integer number (1595052).

Almost surely, 2^20380530 is an apocalyptic number.

20380530 is an abundant number, since it is smaller than the sum of its proper divisors (30661134).

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

20380530 is a wasteful number, since it uses less digits than its factorization.

20380530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29570.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20380530 is about 4514.4800365048. The cubic root of 20380530 is about 273.1524862940.

Adding to 20380530 its reverse (3508302), we get a palindrome (23888832).

It can be divided in two parts, 20380 and 530, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 20380530 in words is "twenty million, three hundred eighty thousand, five hundred thirty".