212020000020 has 72 divisors (see below), whose sum is σ = 647223772104. Its totient is φ = 56178540288.

The previous prime is 212019999979. The next prime is 212020000037. The reversal of 212020000020 is 20000020212.

It can be written as a sum of positive squares in 4 ways, for example, as 1740892176 + 210279107844 = 41724^2 + 458562^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 212019999957 and 212020000011.

It is a congruent 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 23 ways as a sum of consecutive naturals, for example, 3722979 + ... + 3779498.

It is an arithmetic number, because the mean of its divisors is an integer number (8989219057).

Almost surely, 2^212020000020 is an apocalyptic number.

212020000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212020000020 is an abundant number, since it is smaller than the sum of its proper divisors (435203772084).

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

212020000020 is a wasteful number, since it uses less digits than its factorization.

212020000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7502649 (or 7502644 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

Adding to 212020000020 its reverse (20000020212), we get a palindrome (232020020232).

The spelling of 212020000020 in words is "two hundred twelve billion, twenty million, twenty", and thus it is an aban number.