20311313220 has 96 divisors (see below), whose sum is σ = 68935386240. Its totient is φ = 4923953280.

The previous prime is 20311313189. The next prime is 20311313237. The reversal of 20311313220 is 2231311302.

20311313220 is a `hidden beast` number, since 2 + 0 + 311 + 31 + 322 + 0 = 666.

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 = 20311313193 and 20311313202.

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, 1703767 + ... + 1715646.

It is an arithmetic number, because the mean of its divisors is an integer number (718076940).

Almost surely, 2^20311313220 is an apocalyptic number.

20311313220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20311313220 is an abundant number, since it is smaller than the sum of its proper divisors (48624073020).

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

20311313220 is a wasteful number, since it uses less digits than its factorization.

20311313220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3419442 (or 3419434 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 20311313220 its reverse (2231311302), we get a palindrome (22542624522).

The spelling of 20311313220 in words is "twenty billion, three hundred eleven million, three hundred thirteen thousand, two hundred twenty".