20504454220 has 12 divisors (see below), whose sum is σ = 43059353904. Its totient is φ = 8201781680.

The previous prime is 20504454209. The next prime is 20504454241. The reversal of 20504454220 is 2245440502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 512611336 + ... + 512611375.

It is an arithmetic number, because the mean of its divisors is an integer number (3588279492).

Almost surely, 2^20504454220 is an apocalyptic number.

20504454220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20504454220 is an abundant number, since it is smaller than the sum of its proper divisors (22554899684).

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

20504454220 is a wasteful number, since it uses less digits than its factorization.

20504454220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025222720 (or 1025222718 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 28.

Adding to 20504454220 its reverse (2245440502), we get a palindrome (22749894722).

The spelling of 20504454220 in words is "twenty billion, five hundred four million, four hundred fifty-four thousand, two hundred twenty".