20021212020 has 48 divisors (see below), whose sum is σ = 56896112448. Its totient is φ = 5259302400.

The previous prime is 20021212007. The next prime is 20021212031. The reversal of 20021212020 is 2021212002.

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 = 20021211987 and 20021212005.

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, 2486181 + ... + 2494220.

It is an arithmetic number, because the mean of its divisors is an integer number (1185335676).

Almost surely, 2^20021212020 is an apocalyptic number.

20021212020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021212020 is an abundant number, since it is smaller than the sum of its proper divisors (36874900428).

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

20021212020 is a wasteful number, since it uses less digits than its factorization.

20021212020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4980480 (or 4980478 counting only the distinct ones).

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

Adding to 20021212020 its reverse (2021212002), we get a palindrome (22042424022).

The spelling of 20021212020 in words is "twenty billion, twenty-one million, two hundred twelve thousand, twenty".