20221220124 has 72 divisors (see below), whose sum is σ = 58559985120. Its totient is φ = 5763336192.

The previous prime is 20221220093. The next prime is 20221220143. The reversal of 20221220124 is 42102212202.

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

It is a junction number, because it is equal to n+sod(n) for n = 20221220097 and 20221220106.

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 23 ways as a sum of consecutive naturals, for example, 4972 + ... + 201164.

Almost surely, 2^20221220124 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 20221220124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29279992560).

20221220124 is an abundant number, since it is smaller than the sum of its proper divisors (38338764996).

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

20221220124 is a wasteful number, since it uses less digits than its factorization.

20221220124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196619 (or 196614 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 20221220124 its reverse (42102212202), we get a palindrome (62323432326).

The spelling of 20221220124 in words is "twenty billion, two hundred twenty-one million, two hundred twenty thousand, one hundred twenty-four".