20125443220 has 12 divisors (see below), whose sum is σ = 42263430804. Its totient is φ = 8050177280.

The previous prime is 20125443197. The next prime is 20125443241. The reversal of 20125443220 is 2234452102.

It can be written as a sum of positive squares in 2 ways, for example, as 11512860804 + 8612582416 = 107298^2 + 92804^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 503136061 + ... + 503136100.

It is an arithmetic number, because the mean of its divisors is an integer number (3521952567).

Almost surely, 2^20125443220 is an apocalyptic number.

20125443220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20125443220 is an abundant number, since it is smaller than the sum of its proper divisors (22137987584).

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

20125443220 is a wasteful number, since it uses less digits than its factorization.

20125443220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006272170 (or 1006272168 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 20125443220 its reverse (2234452102), we get a palindrome (22359895322).

The spelling of 20125443220 in words is "twenty billion, one hundred twenty-five million, four hundred forty-three thousand, two hundred twenty".