20021722002 has 24 divisors (see below), whose sum is σ = 43383560220. Its totient is φ = 6673420800.

The previous prime is 20021721991. The next prime is 20021722043. The reversal of 20021722002 is 20022712002.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19613722401 + 407999601 = 140049^2 + 20199^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 283002 + ... + 346602.

Almost surely, 2^20021722002 is an apocalyptic number.

20021722002 is an abundant number, since it is smaller than the sum of its proper divisors (23361838218).

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

20021722002 is a wasteful number, since it uses less digits than its factorization.

20021722002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81098 (or 81095 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The spelling of 20021722002 in words is "twenty billion, twenty-one million, seven hundred twenty-two thousand, two".