1220804620 has 36 divisors (see below), whose sum is σ = 2982253680. Its totient is φ = 418561248.

The previous prime is 1220804579. The next prime is 1220804633. The reversal of 1220804620 is 264080221.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 621880 + ... + 623839.

It is an arithmetic number, because the mean of its divisors is an integer number (82840380).

Almost surely, 2^1220804620 is an apocalyptic number.

1220804620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220804620 is an abundant number, since it is smaller than the sum of its proper divisors (1761449060).

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

1220804620 is a wasteful number, since it uses less digits than its factorization.

1220804620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245742 (or 1245733 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 1220804620 is about 34940.0145964480. The cubic root of 1220804620 is about 1068.7645857362.

Adding to 1220804620 its reverse (264080221), we get a palindrome (1484884841).

The spelling of 1220804620 in words is "one billion, two hundred twenty million, eight hundred four thousand, six hundred twenty".