20610220 has 12 divisors (see below), whose sum is σ = 43281504. Its totient is φ = 8244080.

The previous prime is 20610217. The next prime is 20610241. The reversal of 20610220 is 2201602.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20610220.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 515236 + ... + 515275.

It is an arithmetic number, because the mean of its divisors is an integer number (3606792).

Almost surely, 2^20610220 is an apocalyptic number.

20610220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20610220 is an abundant number, since it is smaller than the sum of its proper divisors (22671284).

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

20610220 is a wasteful number, since it uses less digits than its factorization.

20610220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1030520 (or 1030518 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 20610220 is about 4539.8480150772. The cubic root of 20610220 is about 274.1748045408.

Adding to 20610220 its reverse (2201602), we get a palindrome (22811822).

The spelling of 20610220 in words is "twenty million, six hundred ten thousand, two hundred twenty".