20301220 has 12 divisors (see below), whose sum is σ = 42632604. Its totient is φ = 8120480.

The previous prime is 20301209. The next prime is 20301221. The reversal of 20301220 is 2210302.

It can be written as a sum of positive squares in 2 ways, for example, as 15319396 + 4981824 = 3914^2 + 2232^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 20301197 and 20301206.

It is not an unprimeable number, because it can be changed into a prime (20301221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 507511 + ... + 507550.

It is an arithmetic number, because the mean of its divisors is an integer number (3552717).

Almost surely, 2^20301220 is an apocalyptic number.

20301220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20301220 is an abundant number, since it is smaller than the sum of its proper divisors (22331384).

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

20301220 is a wasteful number, since it uses less digits than its factorization.

20301220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015070 (or 1015068 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 20301220 is about 4505.6875169057. The cubic root of 20301220 is about 272.7977051088.

Adding to 20301220 its reverse (2210302), we get a palindrome (22511522).

The spelling of 20301220 in words is "twenty million, three hundred one thousand, two hundred twenty".