22222400020 has 24 divisors (see below), whose sum is σ = 46774834344. Its totient is φ = 8868427776.

The previous prime is 22222399891. The next prime is 22222400021. The reversal of 22222400020 is 2000422222.

It can be written as a sum of positive squares in 4 ways, for example, as 1323649924 + 20898750096 = 36382^2 + 144564^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22222399967 and 22222400003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22222400021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1274389 + ... + 1291708.

It is an arithmetic number, because the mean of its divisors is an integer number (1948951431).

Almost surely, 2^22222400020 is an apocalyptic number.

22222400020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22222400020 is an abundant number, since it is smaller than the sum of its proper divisors (24552434324).

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

22222400020 is a wasteful number, since it uses less digits than its factorization.

22222400020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2566539 (or 2566537 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

Adding to 22222400020 its reverse (2000422222), we get a palindrome (24222822242).

The spelling of 22222400020 in words is "twenty-two billion, two hundred twenty-two million, four hundred thousand, twenty".