20012001220 has 48 divisors (see below), whose sum is σ = 42957186048. Its totient is φ = 7827580800.

The previous prime is 20012001193. The next prime is 20012001221. The reversal of 20012001220 is 2210021002.

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 = 20012001197 and 20012001206.

It is not an unprimeable number, because it can be changed into a prime (20012001221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1131445 + ... + 1148995.

It is an arithmetic number, because the mean of its divisors is an integer number (894941376).

Almost surely, 2^20012001220 is an apocalyptic number.

20012001220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20012001220 is an abundant number, since it is smaller than the sum of its proper divisors (22945184828).

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

20012001220 is a wasteful number, since it uses less digits than its factorization.

20012001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18820 (or 18818 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20012001220 its reverse (2210021002), we get a palindrome (22222022222).

The spelling of 20012001220 in words is "twenty billion, twelve million, one thousand, two hundred twenty".