20031323220 has 48 divisors (see below), whose sum is σ = 62319673920. Its totient is φ = 5341686048.

The previous prime is 20031323203. The next prime is 20031323251. The reversal of 20031323220 is 2232313002.

It is a happy number.

It is a super-2 number, since 2×20031323220² (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 = 20031323193 and 20031323202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18546982 + ... + 18548061.

It is an arithmetic number, because the mean of its divisors is an integer number (1298326540).

Almost surely, 2^20031323220 is an apocalyptic number.

20031323220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20031323220 is an abundant number, since it is smaller than the sum of its proper divisors (42288350700).

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

20031323220 is a wasteful number, since it uses less digits than its factorization.

20031323220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37095061 (or 37095053 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 20031323220 its reverse (2232313002), we get a palindrome (22263636222).

The spelling of 20031323220 in words is "twenty billion, thirty-one million, three hundred twenty-three thousand, two hundred twenty".