23144420 has 24 divisors (see below), whose sum is σ = 52342584. Its totient is φ = 8545536.

The previous prime is 23144419. The next prime is 23144441. The reversal of 23144420 is 2444132.

It can be written as a sum of positive squares in 4 ways, for example, as 27556 + 23116864 = 166^2 + 4808^2 .

It is a super-4 number, since 4×23144420⁴ (a number of 31 digits) contains 4444 as substring.

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 = 23144392 and 23144401.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44249 + ... + 44768.

It is an arithmetic number, because the mean of its divisors is an integer number (2180941).

Almost surely, 2^23144420 is an apocalyptic number.

23144420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23144420 is an abundant number, since it is smaller than the sum of its proper divisors (29198164).

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

23144420 is a wasteful number, since it uses less digits than its factorization.

23144420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89039 (or 89037 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 23144420 is about 4810.8647871251. The cubic root of 23144420 is about 284.9806901865.

Adding to 23144420 its reverse (2444132), we get a palindrome (25588552).

The spelling of 23144420 in words is "twenty-three million, one hundred forty-four thousand, four hundred twenty".