23135420 has 96 divisors (see below), whose sum is σ = 61641216. Its totient is φ = 7084800.

The previous prime is 23135389. The next prime is 23135443. The reversal of 23135420 is 2453132.

It is a happy number.

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 = 23135392 and 23135401.

It is a congruent number.

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, 127730 + ... + 127910.

It is an arithmetic number, because the mean of its divisors is an integer number (642096).

Almost surely, 2^23135420 is an apocalyptic number.

23135420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23135420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30820608).

23135420 is an abundant number, since it is smaller than the sum of its proper divisors (38505796).

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

23135420 is a wasteful number, since it uses less digits than its factorization.

23135420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291 (or 289 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 23135420 is about 4809.9293134099. The cubic root of 23135420 is about 284.9437459506.

Adding to 23135420 its reverse (2453132), we get a palindrome (25588552).

The spelling of 23135420 in words is "twenty-three million, one hundred thirty-five thousand, four hundred twenty".