20022001220 has 36 divisors (see below), whose sum is σ = 45529327620. Its totient is φ = 7392737664.

The previous prime is 20022001199. The next prime is 20022001229. The reversal of 20022001220 is 2210022002.

It can be written as a sum of positive squares in 6 ways, for example, as 312087556 + 19709913664 = 17666^2 + 140392^2 .

It is not an unprimeable number, because it can be changed into a prime (20022001229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2958455 + ... + 2965214.

It is an arithmetic number, because the mean of its divisors is an integer number (1264703545).

Almost surely, 2^20022001220 is an apocalyptic number.

20022001220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20022001220 is an abundant number, since it is smaller than the sum of its proper divisors (25507326400).

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

20022001220 is a wasteful number, since it uses less digits than its factorization.

20022001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5923704 (or 5923689 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

Adding to 20022001220 its reverse (2210022002), we get a palindrome (22232023222).

The spelling of 20022001220 in words is "twenty billion, twenty-two million, one thousand, two hundred twenty".