1772120220 has 96 divisors (see below), whose sum is σ = 5350884672. Its totient is φ = 435621888.

The previous prime is 1772120213. The next prime is 1772120221. The reversal of 1772120220 is 220212771.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1772120221) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 945204 + ... + 947076.

It is an arithmetic number, because the mean of its divisors is an integer number (55738382).

Almost surely, 2^1772120220 is an apocalyptic number.

1772120220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1772120220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2675442336).

1772120220 is an abundant number, since it is smaller than the sum of its proper divisors (3578764452).

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

1772120220 is a wasteful number, since it uses less digits than its factorization.

1772120220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3111 (or 3109 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 1772120220 is about 42096.5582916228. The cubic root of 1772120220 is about 1210.1273048672.

Adding to 1772120220 its reverse (220212771), we get a palindrome (1992332991).

The spelling of 1772120220 in words is "one billion, seven hundred seventy-two million, one hundred twenty thousand, two hundred twenty".