20122650 has 72 divisors (see below), whose sum is σ = 54738684. Its totient is φ = 5299200.

The previous prime is 20122649. The next prime is 20122651. The reversal of 20122650 is 5622102.

20122650 is a `hidden beast` number, since 2 + 0 + 12 + 2 + 650 = 666.

It is an interprime number because it is at equal distance from previous prime (20122649) and next prime (20122651).

It can be written as a sum of positive squares in 6 ways, for example, as 5076009 + 15046641 = 2253^2 + 3879^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122651) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 43420 + ... + 43880.

Almost surely, 2^20122650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20122650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27369342).

20122650 is an abundant number, since it is smaller than the sum of its proper divisors (34616034).

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

20122650 is a wasteful number, since it uses less digits than its factorization.

20122650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576 (or 568 counting only the distinct ones).

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

The square root of 20122650 is about 4485.8276828251. The cubic root of 20122650 is about 271.9955034580.

Adding to 20122650 its reverse (5622102), we get a palindrome (25744752).

The spelling of 20122650 in words is "twenty million, one hundred twenty-two thousand, six hundred fifty".