20533530 has 16 divisors (see below), whose sum is σ = 49280544. Its totient is φ = 5475600.

The previous prime is 20533519. The next prime is 20533531. The reversal of 20533530 is 3533502.

It is a junction number, because it is equal to n+sod(n) for n = 20533497 and 20533506.

It is not an unprimeable number, because it can be changed into a prime (20533531) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 342196 + ... + 342255.

It is an arithmetic number, because the mean of its divisors is an integer number (3080034).

Almost surely, 2^20533530 is an apocalyptic number.

20533530 is an abundant number, since it is smaller than the sum of its proper divisors (28747014).

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

20533530 is a wasteful number, since it uses less digits than its factorization.

20533530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684461.

The product of its (nonzero) digits is 1350, while the sum is 21.

The square root of 20533530 is about 4531.3938253036. The cubic root of 20533530 is about 273.8343165140.

The spelling of 20533530 in words is "twenty million, five hundred thirty-three thousand, five hundred thirty".