20504430 has 24 divisors (see below), whose sum is σ = 53311752. Its totient is φ = 5467824.

The previous prime is 20504417. The next prime is 20504437. The reversal of 20504430 is 3440502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20504437) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 113824 + ... + 114003.

It is an arithmetic number, because the mean of its divisors is an integer number (2221323).

Almost surely, 2^20504430 is an apocalyptic number.

20504430 is an abundant number, since it is smaller than the sum of its proper divisors (32807322).

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

20504430 is a wasteful number, since it uses less digits than its factorization.

20504430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227840 (or 227837 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 20504430 is about 4528.1817543027. The cubic root of 20504430 is about 273.7048965536.

Adding to 20504430 its reverse (3440502), we get a palindrome (23944932).

The spelling of 20504430 in words is "twenty million, five hundred four thousand, four hundred thirty".