20023530 has 32 divisors (see below), whose sum is σ = 50587200. Its totient is φ = 5058432.

The previous prime is 20023519. The next prime is 20023537. The reversal of 20023530 is 3532002.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (20023537) 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 15 ways as a sum of consecutive naturals, for example, 16995 + ... + 18134.

It is an arithmetic number, because the mean of its divisors is an integer number (1580850).

Almost surely, 2^20023530 is an apocalyptic number.

20023530 is an abundant number, since it is smaller than the sum of its proper divisors (30563670).

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

20023530 is a wasteful number, since it uses less digits than its factorization.

20023530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35158.

The product of its (nonzero) digits is 180, while the sum is 15.

The square root of 20023530 is about 4474.7659156653. The cubic root of 20023530 is about 271.5481703513.

Adding to 20023530 its reverse (3532002), we get a palindrome (23555532).

The spelling of 20023530 in words is "twenty million, twenty-three thousand, five hundred thirty".