20220021220 has 48 divisors (see below), whose sum is σ = 49839632640. Its totient is φ = 6745209984.

The previous prime is 20220021167. The next prime is 20220021271. The reversal of 20220021220 is 2212002202.

It is a self number, because there is not a number n which added to its sum of digits gives 20220021220.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1946560 + ... + 1956919.

It is an arithmetic number, because the mean of its divisors is an integer number (1038325680).

Almost surely, 2^20220021220 is an apocalyptic number.

20220021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20220021220 is an abundant number, since it is smaller than the sum of its proper divisors (29619611420).

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

20220021220 is a wasteful number, since it uses less digits than its factorization.

20220021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3903532 (or 3903530 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 20220021220 its reverse (2212002202), we get a palindrome (22432023422).

The spelling of 20220021220 in words is "twenty billion, two hundred twenty million, twenty-one thousand, two hundred twenty".