22020451220 has 24 divisors (see below), whose sum is σ = 48963121704. Its totient is φ = 8290052096.

The previous prime is 22020451213. The next prime is 22020451357. The reversal of 22020451220 is 2215402022.

It can be written as a sum of positive squares in 4 ways, for example, as 11323513744 + 10696937476 = 106412^2 + 103426^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 22020451192 and 22020451201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32382677 + ... + 32383356.

It is an arithmetic number, because the mean of its divisors is an integer number (2040130071).

Almost surely, 2^22020451220 is an apocalyptic number.

22020451220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22020451220 is an abundant number, since it is smaller than the sum of its proper divisors (26942670484).

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

22020451220 is a wasteful number, since it uses less digits than its factorization.

22020451220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64766059 (or 64766057 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

Adding to 22020451220 its reverse (2215402022), we get a palindrome (24235853242).

The spelling of 22020451220 in words is "twenty-two billion, twenty million, four hundred fifty-one thousand, two hundred twenty".