11511302420 has 48 divisors (see below), whose sum is σ = 24610376448. Its totient is φ = 4521861120.

The previous prime is 11511302419. The next prime is 11511302443. The reversal of 11511302420 is 2420311511.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 11511302392 and 11511302401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 349169 + ... + 380711.

It is an arithmetic number, because the mean of its divisors is an integer number (512716176).

Almost surely, 2^11511302420 is an apocalyptic number.

11511302420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11511302420 is an abundant number, since it is smaller than the sum of its proper divisors (13099074028).

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

11511302420 is a wasteful number, since it uses less digits than its factorization.

11511302420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31880 (or 31878 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 11511302420 its reverse (2420311511), we get a palindrome (13931613931).

Subtracting from 11511302420 its reverse (2420311511), we obtain a palindrome (9090990909).

The spelling of 11511302420 in words is "eleven billion, five hundred eleven million, three hundred two thousand, four hundred twenty".