20211000220 has 24 divisors (see below), whose sum is σ = 44288453664. Its totient is φ = 7732904256.

The previous prime is 20211000211. The next prime is 20211000221. The reversal of 20211000220 is 2200011202.

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 = 20211000197 and 20211000206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211000221) 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, 21968019 + ... + 21968938.

It is an arithmetic number, because the mean of its divisors is an integer number (1845352236).

Almost surely, 2^20211000220 is an apocalyptic number.

20211000220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20211000220 is an abundant number, since it is smaller than the sum of its proper divisors (24077453444).

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

20211000220 is a wasteful number, since it uses less digits than its factorization.

20211000220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43936989 (or 43936987 counting only the distinct ones).

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

Adding to 20211000220 its reverse (2200011202), we get a palindrome (22411011422).

The spelling of 20211000220 in words is "twenty billion, two hundred eleven million, two hundred twenty", and thus it is an aban number.