20202020021 has 8 divisors (see below), whose sum is σ = 20775268800. Its totient is φ = 19636466080.

The previous prime is 20202019993. The next prime is 20202020053. The reversal of 20202020021 is 12002020202.

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 20202020021 - 2¹⁴ = 20202003637 is a prime.

It is a super-2 number, since 2×20202020021² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20202019984 and 20202020011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20202029021) 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, 1918385 + ... + 1928886.

It is an arithmetic number, because the mean of its divisors is an integer number (2596908600).

Almost surely, 2^20202020021 is an apocalyptic number.

It is an amenable number.

20202020021 is a deficient number, since it is larger than the sum of its proper divisors (573248779).

20202020021 is an equidigital number, since it uses as much as digits as its factorization.

20202020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3847419.

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

Adding to 20202020021 its reverse (12002020202), we get a palindrome (32204040223).

The spelling of 20202020021 in words is "twenty billion, two hundred two million, twenty thousand, twenty-one".