20220021668 has 48 divisors (see below), whose sum is σ = 44213253504. Its totient is φ = 7860637440.

The previous prime is 20220021667. The next prime is 20220021713. The reversal of 20220021668 is 86612002202.

It is a self number, because there is not a number n which added to its sum of digits gives 20220021668.

It is not an unprimeable number, because it can be changed into a prime (20220021667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68930 + ... + 212582.

It is an arithmetic number, because the mean of its divisors is an integer number (921109448).

Almost surely, 2^20220021668 is an apocalyptic number.

20220021668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20220021668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22106626752).

20220021668 is an abundant number, since it is smaller than the sum of its proper divisors (23993231836).

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

20220021668 is a wasteful number, since it uses less digits than its factorization.

20220021668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144132 (or 144130 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The spelling of 20220021668 in words is "twenty billion, two hundred twenty million, twenty-one thousand, six hundred sixty-eight".