20006620 has 72 divisors (see below), whose sum is σ = 47237904. Its totient is φ = 7091712.

The previous prime is 20006611. The next prime is 20006621. The reversal of 20006620 is 2660002.

It is a junction number, because it is equal to n+sod(n) for n = 20006594 and 20006603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20006621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 122659 + ... + 122821.

It is an arithmetic number, because the mean of its divisors is an integer number (656082).

Almost surely, 2^20006620 is an apocalyptic number.

20006620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20006620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23618952).

20006620 is an abundant number, since it is smaller than the sum of its proper divisors (27231284).

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

20006620 is a wasteful number, since it uses less digits than its factorization.

20006620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227 (or 206 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20006620 is about 4472.8760322638. The cubic root of 20006620 is about 271.4717074301.

Adding to 20006620 its reverse (2660002), we get a palindrome (22666622).

The spelling of 20006620 in words is "twenty million, six thousand, six hundred twenty".