20222878644 has 108 divisors (see below), whose sum is σ = 53790685312. Its totient is φ = 6399432000.

The previous prime is 20222878633. The next prime is 20222878679. The reversal of 20222878644 is 44687822202.

It is a self number, because there is not a number n which added to its sum of digits gives 20222878644.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3131619 + ... + 3138069.

Almost surely, 2^20222878644 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 20222878644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26895342656).

20222878644 is an abundant number, since it is smaller than the sum of its proper divisors (33567806668).

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

20222878644 is a wasteful number, since it uses less digits than its factorization.

20222878644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6598 (or 6540 counting only the distinct ones).

The product of its (nonzero) digits is 688128, while the sum is 45.

The spelling of 20222878644 in words is "twenty billion, two hundred twenty-two million, eight hundred seventy-eight thousand, six hundred forty-four".