20021012020 has 24 divisors (see below), whose sum is σ = 42099405768. Its totient is φ = 7997875200.

The previous prime is 20021012003. The next prime is 20021012041. The reversal of 20021012020 is 2021012002.

It can be written as a sum of positive squares in 4 ways, for example, as 847624996 + 19173387024 = 29114^2 + 138468^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 20021011988 and 20021012006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 642501 + ... + 672940.

It is an arithmetic number, because the mean of its divisors is an integer number (1754141907).

Almost surely, 2^20021012020 is an apocalyptic number.

20021012020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021012020 is an abundant number, since it is smaller than the sum of its proper divisors (22078393748).

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

20021012020 is a wasteful number, since it uses less digits than its factorization.

20021012020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1316211 (or 1316209 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20021012020 its reverse (2021012002), we get a palindrome (22042024022).

The spelling of 20021012020 in words is "twenty billion, twenty-one million, twelve thousand, twenty".