20221116640 has 96 divisors (see below), whose sum is σ = 48387465504. Its totient is φ = 7984742400.

The previous prime is 20221116631. The next prime is 20221116653. The reversal of 20221116640 is 4661112202.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7091215 + ... + 7094065.

It is an arithmetic number, because the mean of its divisors is an integer number (504036099).

Almost surely, 2^20221116640 is an apocalyptic number.

20221116640 is a gapful number since it is divisible by the number (20) 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 20221116640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24193732752).

20221116640 is an abundant number, since it is smaller than the sum of its proper divisors (28166348864).

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

20221116640 is a wasteful number, since it uses less digits than its factorization.

20221116640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3420 (or 3412 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 20221116640 its reverse (4661112202), we get a palindrome (24882228842).

The spelling of 20221116640 in words is "twenty billion, two hundred twenty-one million, one hundred sixteen thousand, six hundred forty".