1646450220 has 48 divisors (see below), whose sum is σ = 4717278720. Its totient is φ = 428842176.

The previous prime is 1646450219. The next prime is 1646450227. The reversal of 1646450220 is 220546461.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (1646450227) 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 15 ways as a sum of consecutive naturals, for example, 316500 + ... + 321659.

It is an arithmetic number, because the mean of its divisors is an integer number (98276640).

Almost surely, 2^1646450220 is an apocalyptic number.

1646450220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1646450220 is an abundant number, since it is smaller than the sum of its proper divisors (3070828500).

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

1646450220 is a wasteful number, since it uses less digits than its factorization.

1646450220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638214 (or 638212 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 1646450220 is about 40576.4737255469. The cubic root of 1646450220 is about 1180.8177373062.

Adding to 1646450220 its reverse (220546461), we get a palindrome (1866996681).

The spelling of 1646450220 in words is "one billion, six hundred forty-six million, four hundred fifty thousand, two hundred twenty".