20020200021 has 24 divisors (see below), whose sum is σ = 29608646496. Its totient is φ = 13028450400.

The previous prime is 20020199981. The next prime is 20020200023. The reversal of 20020200021 is 12000202002.

It is not a de Polignac number, because 20020200021 - 2¹⁷ = 20020068949 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20020199976 and 20020200012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020200023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 655746 + ... + 685596.

It is an arithmetic number, because the mean of its divisors is an integer number (1233693604).

Almost surely, 2^20020200021 is an apocalyptic number.

It is an amenable number.

20020200021 is a deficient number, since it is larger than the sum of its proper divisors (9588446475).

20020200021 is a wasteful number, since it uses less digits than its factorization.

20020200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31633 (or 31630 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

Adding to 20020200021 its reverse (12000202002), we get a palindrome (32020402023).

The spelling of 20020200021 in words is "twenty billion, twenty million, two hundred thousand, twenty-one".