20020001220 has 36 divisors (see below), whose sum is σ = 60727337580. Its totient is φ = 5338666944.

The previous prime is 20020001219. The next prime is 20020001237. The reversal of 20020001220 is 2210002002.

It can be written as a sum of positive squares in 2 ways, for example, as 14612457924 + 5407543296 = 120882^2 + 73536^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55610935 + ... + 55611294.

Almost surely, 2^20020001220 is an apocalyptic number.

20020001220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20020001220 is an abundant number, since it is smaller than the sum of its proper divisors (40707336360).

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

20020001220 is a wasteful number, since it uses less digits than its factorization.

20020001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111222244 (or 111222239 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

Adding to 20020001220 its reverse (2210002002), we get a palindrome (22230003222).

The spelling of 20020001220 in words is "twenty billion, twenty million, one thousand, two hundred twenty".