20113220 has 12 divisors (see below), whose sum is σ = 42237804. Its totient is φ = 8045280.

The previous prime is 20113217. The next prime is 20113231. The reversal of 20113220 is 2231102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10291264 + 9821956 = 3208^2 + 3134^2 .

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, 502811 + ... + 502850.

It is an arithmetic number, because the mean of its divisors is an integer number (3519817).

Almost surely, 2^20113220 is an apocalyptic number.

20113220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20113220 is an abundant number, since it is smaller than the sum of its proper divisors (22124584).

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

20113220 is a wasteful number, since it uses less digits than its factorization.

20113220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005670 (or 1005668 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 20113220 is about 4484.7764715758. The cubic root of 20113220 is about 271.9530087507.

Adding to 20113220 its reverse (2231102), we get a palindrome (22344322).

The spelling of 20113220 in words is "twenty million, one hundred thirteen thousand, two hundred twenty".