20544304220 has 24 divisors (see below), whose sum is σ = 47065133808. Its totient is φ = 7470656000.

The previous prime is 20544304217. The next prime is 20544304229. The reversal of 20544304220 is 2240344502.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20544304220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20544304229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46691381 + ... + 46691820.

It is an arithmetic number, because the mean of its divisors is an integer number (1961047242).

Almost surely, 2^20544304220 is an apocalyptic number.

20544304220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20544304220 is an abundant number, since it is smaller than the sum of its proper divisors (26520829588).

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

20544304220 is a wasteful number, since it uses less digits than its factorization.

20544304220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93383221 (or 93383219 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 26.

Adding to 20544304220 its reverse (2240344502), we get a palindrome (22784648722).

The spelling of 20544304220 in words is "twenty billion, five hundred forty-four million, three hundred four thousand, two hundred twenty".