20000001220 has 24 divisors (see below), whose sum is σ = 44470591704. Its totient is φ = 7529412096.

The previous prime is 20000001181. The next prime is 20000001221. The reversal of 20000001220 is 2210000002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2479243264 + 17520757956 = 49792^2 + 132366^2 .

It is not an unprimeable number, because it can be changed into a prime (20000001221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29411427 + ... + 29412106.

It is an arithmetic number, because the mean of its divisors is an integer number (1852941321).

Almost surely, 2^20000001220 is an apocalyptic number.

20000001220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20000001220 is an abundant number, since it is smaller than the sum of its proper divisors (24470590484).

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

20000001220 is a wasteful number, since it uses less digits than its factorization.

20000001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58823559 (or 58823557 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

Adding to 20000001220 its reverse (2210000002), we get a palindrome (22210001222).

The spelling of 20000001220 in words is "twenty billion, one thousand, two hundred twenty".