2220401720 has 16 divisors (see below), whose sum is σ = 4995903960. Its totient is φ = 888160672.

The previous prime is 2220401681. The next prime is 2220401737. The reversal of 2220401720 is 271040222.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 2220401692 and 2220401701.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27754982 + ... + 27755061.

Almost surely, 2^2220401720 is an apocalyptic number.

2220401720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2220401720 is an abundant number, since it is smaller than the sum of its proper divisors (2775502240).

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

2220401720 is a wasteful number, since it uses less digits than its factorization.

2220401720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55510054 (or 55510050 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 2220401720 is about 47121.1387808062. The cubic root of 2220401720 is about 1304.5994317725.

Adding to 2220401720 its reverse (271040222), we get a palindrome (2491441942).

The spelling of 2220401720 in words is "two billion, two hundred twenty million, four hundred one thousand, seven hundred twenty".