20522220 has 24 divisors (see below), whose sum is σ = 57462384. Its totient is φ = 5472576.

The previous prime is 20522219. The next prime is 20522239. The reversal of 20522220 is 2222502.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20522220.

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, 170959 + ... + 171078.

It is an arithmetic number, because the mean of its divisors is an integer number (2394266).

Almost surely, 2^20522220 is an apocalyptic number.

20522220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20522220 is an abundant number, since it is smaller than the sum of its proper divisors (36940164).

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

20522220 is a wasteful number, since it uses less digits than its factorization.

20522220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342049 (or 342047 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 20522220 is about 4530.1456930214. The cubic root of 20522220 is about 273.7840307144.

Adding to 20522220 its reverse (2222502), we get a palindrome (22744722).

The spelling of 20522220 in words is "twenty million, five hundred twenty-two thousand, two hundred twenty".