20012112220 has 24 divisors (see below), whose sum is σ = 42032297664. Its totient is φ = 8003537856.

The previous prime is 20012112209. The next prime is 20012112223. The reversal of 20012112220 is 2221121002.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20012112220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012112223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48957 + ... + 205963.

It is an arithmetic number, because the mean of its divisors is an integer number (1751345736).

Almost surely, 2^20012112220 is an apocalyptic number.

20012112220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20012112220 is an abundant number, since it is smaller than the sum of its proper divisors (22020185444).

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

20012112220 is a wasteful number, since it uses less digits than its factorization.

20012112220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163389 (or 163387 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20012112220 its reverse (2221121002), we get a palindrome (22233233222).

The spelling of 20012112220 in words is "twenty billion, twelve million, one hundred twelve thousand, two hundred twenty".