20011201220 has 24 divisors (see below), whose sum is σ = 43379121408. Its totient is φ = 7746271200.

The previous prime is 20011201213. The next prime is 20011201229. The reversal of 20011201220 is 2210211002.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20011201229) 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, 16137446 + ... + 16138685.

It is an arithmetic number, because the mean of its divisors is an integer number (1807463392).

Almost surely, 2^20011201220 is an apocalyptic number.

20011201220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011201220 is an abundant number, since it is smaller than the sum of its proper divisors (23367920188).

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

20011201220 is a wasteful number, since it uses less digits than its factorization.

20011201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32276171 (or 32276169 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20011201220 its reverse (2210211002), we get a palindrome (22221412222).

The spelling of 20011201220 in words is "twenty billion, eleven million, two hundred one thousand, two hundred twenty".