20506122 has 120 divisors (see below), whose sum is σ = 57394656. Its totient is φ = 5357664.

The previous prime is 20506093. The next prime is 20506151. The reversal of 20506122 is 22160502.

20506122 is a `hidden beast` number, since 2 + 0 + 50 + 612 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (20506093) and next prime (20506151).

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 = 20506095 and 20506104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 191593 + ... + 191699.

Almost surely, 2^20506122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20506122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28697328).

20506122 is an abundant number, since it is smaller than the sum of its proper divisors (36888534).

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

20506122 is a wasteful number, since it uses less digits than its factorization.

20506122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20506122 is about 4528.3685804051. The cubic root of 20506122 is about 273.7124249421.

Adding to 20506122 its reverse (22160502), we get a palindrome (42666624).

The spelling of 20506122 in words is "twenty million, five hundred six thousand, one hundred twenty-two".