12311720 has 32 divisors (see below), whose sum is σ = 27841320. Its totient is φ = 4899840.

The previous prime is 12311711. The next prime is 12311729. The reversal of 12311720 is 2711321.

It is an interprime number because it is at equal distance from previous prime (12311711) and next prime (12311729).

It can be written as a sum of positive squares in 4 ways, for example, as 10719076 + 1592644 = 3274^2 + 1262^2 .

It is not an unprimeable number, because it can be changed into a prime (12311729) 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, 8660 + ... + 9980.

Almost surely, 2^12311720 is an apocalyptic number.

12311720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12311720 is an abundant number, since it is smaller than the sum of its proper divisors (15529600).

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

12311720 is a wasteful number, since it uses less digits than its factorization.

12311720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565 (or 1561 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 12311720 is about 3508.8060647462. The cubic root of 12311720 is about 230.9083174080.

It can be divided in two parts, 12311 and 720, that added together give a palindrome (13031).

The spelling of 12311720 in words is "twelve million, three hundred eleven thousand, seven hundred twenty".