20555322330 has 64 divisors (see below), whose sum is σ = 51984115200. Its totient is φ = 5187435840.

The previous prime is 20555322329. The next prime is 20555322371. The reversal of 20555322330 is 3322355502.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 534901 + ... + 572039.

It is an arithmetic number, because the mean of its divisors is an integer number (812251800).

Almost surely, 2^20555322330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20555322330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25992057600).

20555322330 is an abundant number, since it is smaller than the sum of its proper divisors (31428792870).

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

20555322330 is a wasteful number, since it uses less digits than its factorization.

20555322330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38139.

The product of its (nonzero) digits is 27000, while the sum is 30.

Adding to 20555322330 its reverse (3322355502), we get a palindrome (23877677832).

The spelling of 20555322330 in words is "twenty billion, five hundred fifty-five million, three hundred twenty-two thousand, three hundred thirty".