20544451236 has 72 divisors (see below), whose sum is σ = 52466614200. Its totient is φ = 6777768960.

The previous prime is 20544451229. The next prime is 20544451241. The reversal of 20544451236 is 63215444502.

20544451236 is a `hidden beast` number, since 20 + 54 + 44 + 512 + 36 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 697276836 + 19847174400 = 26406^2 + 140880^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20544451236.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4349356 + ... + 4354076.

It is an arithmetic number, because the mean of its divisors is an integer number (728702975).

Almost surely, 2^20544451236 is an apocalyptic number.

It is an amenable number.

20544451236 is an abundant number, since it is smaller than the sum of its proper divisors (31922162964).

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

20544451236 is a wasteful number, since it uses less digits than its factorization.

20544451236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5949 (or 5944 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

Adding to 20544451236 its reverse (63215444502), we get a palindrome (83759895738).

The spelling of 20544451236 in words is "twenty billion, five hundred forty-four million, four hundred fifty-one thousand, two hundred thirty-six".