20320223220 has 96 divisors (see below), whose sum is σ = 68965626240. Its totient is φ = 4926113280.

The previous prime is 20320223219. The next prime is 20320223243. The reversal of 20320223220 is 2232202302.

20320223220 is a `hidden beast` number, since 2 + 0 + 320 + 22 + 322 + 0 = 666.

It is a super-2 number, since 2×20320223220² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20320223193 and 20320223202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1704517 + ... + 1716396.

It is an arithmetic number, because the mean of its divisors is an integer number (718391940).

Almost surely, 2^20320223220 is an apocalyptic number.

20320223220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20320223220 is an abundant number, since it is smaller than the sum of its proper divisors (48645403020).

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

20320223220 is a wasteful number, since it uses less digits than its factorization.

20320223220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3420942 (or 3420934 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 18.

Adding to 20320223220 its reverse (2232202302), we get a palindrome (22552425522).

The spelling of 20320223220 in words is "twenty billion, three hundred twenty million, two hundred twenty-three thousand, two hundred twenty".