20110123220 has 48 divisors (see below), whose sum is σ = 46701603648. Its totient is φ = 7212591360.

The previous prime is 20110123219. The next prime is 20110123237. The reversal of 20110123220 is 2232101102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20110123195 and 20110123204.

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, 610034 + ... + 642153.

It is an arithmetic number, because the mean of its divisors is an integer number (972950076).

Almost surely, 2^20110123220 is an apocalyptic number.

20110123220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20110123220 is an abundant number, since it is smaller than the sum of its proper divisors (26591480428).

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

20110123220 is a wasteful number, since it uses less digits than its factorization.

20110123220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252280 (or 1252278 counting only the distinct ones).

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

Adding to 20110123220 its reverse (2232101102), we get a palindrome (22342224322).

The spelling of 20110123220 in words is "twenty billion, one hundred ten million, one hundred twenty-three thousand, two hundred twenty".