20001223220 has 24 divisors (see below), whose sum is σ = 45820984608. Its totient is φ = 7273172000.

The previous prime is 20001223189. The next prime is 20001223241. The reversal of 20001223220 is 2232210002.

It is a super-3 number, since 3×20001223220³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20001223195 and 20001223204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45457106 + ... + 45457545.

It is an arithmetic number, because the mean of its divisors is an integer number (1909207692).

Almost surely, 2^20001223220 is an apocalyptic number.

20001223220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001223220 is an abundant number, since it is smaller than the sum of its proper divisors (25819761388).

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

20001223220 is a wasteful number, since it uses less digits than its factorization.

20001223220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90914671 (or 90914669 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

Adding to 20001223220 its reverse (2232210002), we get a palindrome (22233433222).

The spelling of 20001223220 in words is "twenty billion, one million, two hundred twenty-three thousand, two hundred twenty".