20012220020 has 24 divisors (see below), whose sum is σ = 45258405864. Its totient is φ = 7389127296.

The previous prime is 20012220001. The next prime is 20012220023. The reversal of 20012220020 is 2002221002.

It can be written as a sum of positive squares in 4 ways, for example, as 3831362404 + 16180857616 = 61898^2 + 127204^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20012219983 and 20012220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012220023) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 38484779 + ... + 38485298.

It is an arithmetic number, because the mean of its divisors is an integer number (1885766911).

Almost surely, 2^20012220020 is an apocalyptic number.

20012220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20012220020 is an abundant number, since it is smaller than the sum of its proper divisors (25246185844).

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

20012220020 is a wasteful number, since it uses less digits than its factorization.

20012220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76970099 (or 76970097 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

Adding to 20012220020 its reverse (2002221002), we get a palindrome (22014441022).

The spelling of 20012220020 in words is "twenty billion, twelve million, two hundred twenty thousand, twenty".