511222220 has 24 divisors (see below), whose sum is σ = 1073991408. Its totient is φ = 204408000.

The previous prime is 511222211. The next prime is 511222247. The reversal of 511222220 is 22222115.

It is a super-2 number, since 2×511222220² = 522696316443456800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97670 + ... + 102770.

It is an arithmetic number, because the mean of its divisors is an integer number (44749642).

Almost surely, 2^511222220 is an apocalyptic number.

It is an amenable number.

511222220 is an abundant number, since it is smaller than the sum of its proper divisors (562769188).

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

511222220 is a wasteful number, since it uses less digits than its factorization.

511222220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10121 (or 10119 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 511222220 is about 22610.2237936735. The cubic root of 511222220 is about 799.5947009505.

Adding to 511222220 its reverse (22222115), we get a palindrome (533444335).

The spelling of 511222220 in words is "five hundred eleven million, two hundred twenty-two thousand, two hundred twenty".