20021123220 has 96 divisors (see below), whose sum is σ = 64492087296. Its totient is φ = 4545936000.

The previous prime is 20021123219. The next prime is 20021123263. The reversal of 20021123220 is 2232112002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20021123220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 94426 + ... + 221265.

It is an arithmetic number, because the mean of its divisors is an integer number (671792576).

Almost surely, 2^20021123220 is an apocalyptic number.

20021123220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021123220 is an abundant number, since it is smaller than the sum of its proper divisors (44470964076).

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

20021123220 is a wasteful number, since it uses less digits than its factorization.

20021123220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315861 (or 315859 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 20021123220 its reverse (2232112002), we get a palindrome (22253235222).

The spelling of 20021123220 in words is "twenty billion, twenty-one million, one hundred twenty-three thousand, two hundred twenty".