1220520204 has 48 divisors (see below), whose sum is σ = 3166581600. Its totient is φ = 406548288.

The previous prime is 1220520137. The next prime is 1220520211. The reversal of 1220520204 is 4020250221.

1220520204 is a `hidden beast` number, since 122 + 0 + 520 + 20 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 190054 + ... + 196370.

It is an arithmetic number, because the mean of its divisors is an integer number (65970450).

Almost surely, 2^1220520204 is an apocalyptic number.

It is an amenable number.

1220520204 is an abundant number, since it is smaller than the sum of its proper divisors (1946061396).

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

1220520204 is a wasteful number, since it uses less digits than its factorization.

1220520204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8119 (or 8111 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 1220520204 is about 34935.9442981008. The cubic root of 1220520204 is about 1068.6815810925.

Adding to 1220520204 its reverse (4020250221), we get a palindrome (5240770425).

The spelling of 1220520204 in words is "one billion, two hundred twenty million, five hundred twenty thousand, two hundred four".