20010221220 has 48 divisors (see below), whose sum is σ = 61122132288. Its totient is φ = 4850962560.

The previous prime is 20010221213. The next prime is 20010221221. The reversal of 20010221220 is 2212201002.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20010221196 and 20010221205.

It is not an unprimeable number, because it can be changed into a prime (20010221221) 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, 15158599 + ... + 15159918.

It is an arithmetic number, because the mean of its divisors is an integer number (1273377756).

Almost surely, 2^20010221220 is an apocalyptic number.

20010221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20010221220 is an abundant number, since it is smaller than the sum of its proper divisors (41111911068).

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

20010221220 is a wasteful number, since it uses less digits than its factorization.

20010221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30318540 (or 30318538 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20010221220 its reverse (2212201002), we get a palindrome (22222422222).

The spelling of 20010221220 in words is "twenty billion, ten million, two hundred twenty-one thousand, two hundred twenty".