20111023320 has 32 divisors (see below), whose sum is σ = 60333070320. Its totient is φ = 5362939520.

The previous prime is 20111023301. The next prime is 20111023351. The reversal of 20111023320 is 2332011102.

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 20111023320.

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, 83795811 + ... + 83796050.

Almost surely, 2^20111023320 is an apocalyptic number.

20111023320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111023320 is an abundant number, since it is smaller than the sum of its proper divisors (40222047000).

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

20111023320 is a wasteful number, since it uses less digits than its factorization.

20111023320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167591875 (or 167591871 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 20111023320 its reverse (2332011102), we get a palindrome (22443034422).

The spelling of 20111023320 in words is "twenty billion, one hundred eleven million, twenty-three thousand, three hundred twenty".