20221550356 has 144 divisors (see below), whose sum is σ = 45220425600. Its totient is φ = 7723434240.

The previous prime is 20221550341. The next prime is 20221550417. The reversal of 20221550356 is 65305512202.

It is a happy number.

It is a super-2 number, since 2×20221550356² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 18915790 + ... + 18916858.

Almost surely, 2^20221550356 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20221550356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22610212800).

20221550356 is an abundant number, since it is smaller than the sum of its proper divisors (24998875244).

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

20221550356 is a wasteful number, since it uses less digits than its factorization.

20221550356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1198 (or 1165 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

The spelling of 20221550356 in words is "twenty billion, two hundred twenty-one million, five hundred fifty thousand, three hundred fifty-six".