20011222320 has 80 divisors (see below), whose sum is σ = 62960732160. Its totient is φ = 5256675072.

The previous prime is 20011222307. The next prime is 20011222367. The reversal of 20011222320 is 2322211002.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

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 20011222320.

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, 606160 + ... + 638319.

It is an arithmetic number, because the mean of its divisors is an integer number (787009152).

Almost surely, 2^20011222320 is an apocalyptic number.

20011222320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011222320 is an abundant number, since it is smaller than the sum of its proper divisors (42949509840).

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

20011222320 is a wasteful number, since it uses less digits than its factorization.

20011222320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244562 (or 1244556 counting only the distinct ones).

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

Adding to 20011222320 its reverse (2322211002), we get a palindrome (22333433322).

The spelling of 20011222320 in words is "twenty billion, eleven million, two hundred twenty-two thousand, three hundred twenty".