20020022021 has 8 divisors (see below), whose sum is σ = 20301574104. Its totient is φ = 19738667520.

The previous prime is 20020021993. The next prime is 20020022051. The reversal of 20020022021 is 12022002002.

It can be written as a sum of positive squares in 4 ways, for example, as 890365921 + 19129656100 = 29839^2 + 138310^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20020022021 - 2¹⁰ = 20020020997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20020021993 and 20020022011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020022051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160925 + ... + 256781.

It is an arithmetic number, because the mean of its divisors is an integer number (2537696763).

Almost surely, 2^20020022021 is an apocalyptic number.

It is an amenable number.

20020022021 is a deficient number, since it is larger than the sum of its proper divisors (281552083).

20020022021 is an equidigital number, since it uses as much as digits as its factorization.

20020022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98791.

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

Adding to 20020022021 its reverse (12022002002), we get a palindrome (32042024023).

The spelling of 20020022021 in words is "twenty billion, twenty million, twenty-two thousand, twenty-one".