1220758820 has 24 divisors (see below), whose sum is σ = 2623213824. Its totient is φ = 476947296.

The previous prime is 1220758813. The next prime is 1220758823. The reversal of 1220758820 is 288570221.

It is not an unprimeable number, because it can be changed into a prime (1220758823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 708884 + ... + 710603.

It is an arithmetic number, because the mean of its divisors is an integer number (109300576).

Almost surely, 2^1220758820 is an apocalyptic number.

1220758820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220758820 is an abundant number, since it is smaller than the sum of its proper divisors (1402455004).

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

1220758820 is a wasteful number, since it uses less digits than its factorization.

1220758820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1419539 (or 1419537 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 1220758820 is about 34939.3591813015. The cubic root of 1220758820 is about 1068.7512202259.

The spelling of 1220758820 in words is "one billion, two hundred twenty million, seven hundred fifty-eight thousand, eight hundred twenty".