22131772020 has 192 divisors, whose sum is σ = 70674912000. Its totient is φ = 5747645952.

The previous prime is 22131772009. The next prime is 22131772021. The reversal of 22131772020 is 2027713122.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22131772021) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3469554 + ... + 3475926.

It is an arithmetic number, because the mean of its divisors is an integer number (368098500).

Almost surely, 2^22131772020 is an apocalyptic number.

22131772020 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 22131772020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35337456000).

22131772020 is an abundant number, since it is smaller than the sum of its proper divisors (48543139980).

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

22131772020 is a wasteful number, since it uses less digits than its factorization.

22131772020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6559 (or 6551 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The spelling of 22131772020 in words is "twenty-two billion, one hundred thirty-one million, seven hundred seventy-two thousand, twenty".