20110312220 has 48 divisors (see below), whose sum is σ = 43348592448. Its totient is φ = 7832163840.

The previous prime is 20110312199. The next prime is 20110312241. The reversal of 20110312220 is 2221301102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20110312199) and next prime (20110312241).

It is a junction number, because it is equal to n+sod(n) for n = 20110312195 and 20110312204.

It is a congruent number.

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, 388082 + ... + 436838.

It is an arithmetic number, because the mean of its divisors is an integer number (903095676).

Almost surely, 2^20110312220 is an apocalyptic number.

20110312220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20110312220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21674296224).

20110312220 is an abundant number, since it is smaller than the sum of its proper divisors (23238280228).

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

20110312220 is a wasteful number, since it uses less digits than its factorization.

20110312220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49310 (or 49308 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20110312220 its reverse (2221301102), we get a palindrome (22331613322).

The spelling of 20110312220 in words is "twenty billion, one hundred ten million, three hundred twelve thousand, two hundred twenty".