20011220220 has 48 divisors (see below), whose sum is σ = 56037703680. Its totient is φ = 5335726656.

The previous prime is 20011220213. The next prime is 20011220231. The reversal of 20011220220 is 2202211002.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20011220196 and 20011220205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 866949 + ... + 889731.

It is an arithmetic number, because the mean of its divisors is an integer number (1167452160).

Almost surely, 2^20011220220 is an apocalyptic number.

20011220220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011220220 is an abundant number, since it is smaller than the sum of its proper divisors (36026483460).

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

20011220220 is a wasteful number, since it uses less digits than its factorization.

20011220220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37434 (or 37432 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20011220220 its reverse (2202211002), we get a palindrome (22213431222).

It can be divided in two parts, 2001 and 1220220, that added together give a palindrome (1222221).

The spelling of 20011220220 in words is "twenty billion, eleven million, two hundred twenty thousand, two hundred twenty".