20016620 has 48 divisors (see below), whose sum is σ = 45638208. Its totient is φ = 7330560.

The previous prime is 20016613. The next prime is 20016631. The reversal of 20016620 is 2661002.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43190 + ... + 43650.

It is an arithmetic number, because the mean of its divisors is an integer number (950796).

Almost surely, 2^20016620 is an apocalyptic number.

20016620 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 20016620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22819104).

20016620 is an abundant number, since it is smaller than the sum of its proper divisors (25621588).

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

20016620 is a wasteful number, since it uses less digits than its factorization.

20016620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650 (or 648 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 20016620 is about 4473.9937416139. The cubic root of 20016620 is about 271.5169302096.

Adding to 20016620 its reverse (2661002), we get a palindrome (22677622).

The spelling of 20016620 in words is "twenty million, sixteen thousand, six hundred twenty".