20012212220 has 96 divisors (see below), whose sum is σ = 56426098176. Its totient is φ = 5757753600.

The previous prime is 20012212151. The next prime is 20012212261. The reversal of 20012212220 is 2221221002.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 20012212195 and 20012212204.

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 31 ways as a sum of consecutive naturals, for example, 479786 + ... + 519825.

It is an arithmetic number, because the mean of its divisors is an integer number (587771856).

Almost surely, 2^20012212220 is an apocalyptic number.

20012212220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20012212220 is an abundant number, since it is smaller than the sum of its proper divisors (36413885956).

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

20012212220 is a wasteful number, since it uses less digits than its factorization.

20012212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999651 (or 999649 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20012212220 its reverse (2221221002), we get a palindrome (22233433222).

It can be divided in two parts, 20012 and 212220, that added together give a palindrome (232232).

The spelling of 20012212220 in words is "twenty billion, twelve million, two hundred twelve thousand, two hundred twenty".