20330312220 has 144 divisors (see below), whose sum is σ = 62440979328. Its totient is φ = 5353804800.

The previous prime is 20330312203. The next prime is 20330312231. The reversal of 20330312220 is 2221303302.

It is a happy number.

20330312220 is a `hidden beast` number, since 2 + 0 + 330 + 312 + 2 + 20 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 20330312193 and 20330312202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8307037 + ... + 8309483.

It is an arithmetic number, because the mean of its divisors is an integer number (433617912).

Almost surely, 2^20330312220 is an apocalyptic number.

20330312220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20330312220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31220489664).

20330312220 is an abundant number, since it is smaller than the sum of its proper divisors (42110667108).

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

20330312220 is a wasteful number, since it uses less digits than its factorization.

20330312220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3020 (or 3015 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 20330312220 its reverse (2221303302), we get a palindrome (22551615522).

The spelling of 20330312220 in words is "twenty billion, three hundred thirty million, three hundred twelve thousand, two hundred twenty".