20311243320 has 32 divisors (see below), whose sum is σ = 60933730320. Its totient is φ = 5416331520.

The previous prime is 20311243283. The next prime is 20311243327. The reversal of 20311243320 is 2334211302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311243327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84630061 + ... + 84630300.

Almost surely, 2^20311243320 is an apocalyptic number.

20311243320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20311243320 is an abundant number, since it is smaller than the sum of its proper divisors (40622487000).

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

20311243320 is a wasteful number, since it uses less digits than its factorization.

20311243320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169260375 (or 169260371 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 20311243320 its reverse (2334211302), we get a palindrome (22645454622).

The spelling of 20311243320 in words is "twenty billion, three hundred eleven million, two hundred forty-three thousand, three hundred twenty".