20020221988 has 18 divisors (see below), whose sum is σ = 37937729634. Its totient is φ = 9240102144.

The previous prime is 20020221979. The next prime is 20020222049. The reversal of 20020221988 is 88912202002.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 529828324 + 19490393664 = 23018^2 + 139608^2 .

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 14807181 + ... + 14808532.

Almost surely, 2^20020221988 is an apocalyptic number.

It is an amenable number.

20020221988 is a deficient number, since it is larger than the sum of its proper divisors (17917507646).

20020221988 is a wasteful number, since it uses less digits than its factorization.

20020221988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29615743 (or 29615728 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The spelling of 20020221988 in words is "twenty billion, twenty million, two hundred twenty-one thousand, nine hundred eighty-eight".