20021211020 has 24 divisors (see below), whose sum is σ = 43070021568. Its totient is φ = 7813155200.

The previous prime is 20021211017. The next prime is 20021211053. The reversal of 20021211020 is 2011212002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20021210992 and 20021211010.

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 7 ways as a sum of consecutive naturals, for example, 12207236 + ... + 12208875.

It is an arithmetic number, because the mean of its divisors is an integer number (1794584232).

Almost surely, 2^20021211020 is an apocalyptic number.

20021211020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021211020 is an abundant number, since it is smaller than the sum of its proper divisors (23048810548).

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

20021211020 is a wasteful number, since it uses less digits than its factorization.

20021211020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24416161 (or 24416159 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20021211020 its reverse (2011212002), we get a palindrome (22032423022).

The spelling of 20021211020 in words is "twenty billion, twenty-one million, two hundred eleven thousand, twenty".