23154820 has 24 divisors (see below), whose sum is σ = 52366104. Its totient is φ = 8549376.

The previous prime is 23154763. The next prime is 23154829. The reversal of 23154820 is 2845132.

It can be written as a sum of positive squares in 4 ways, for example, as 287296 + 22867524 = 536^2 + 4782^2 .

It is a super-2 number, since 2×23154820² = 1072291378464800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23154829) 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, 44269 + ... + 44788.

It is an arithmetic number, because the mean of its divisors is an integer number (2181921).

Almost surely, 2^23154820 is an apocalyptic number.

23154820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23154820 is an abundant number, since it is smaller than the sum of its proper divisors (29211284).

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

23154820 is a wasteful number, since it uses less digits than its factorization.

23154820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89079 (or 89077 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 23154820 is about 4811.9455524767. The cubic root of 23154820 is about 285.0233693774.

Adding to 23154820 its reverse (2845132), we get a palindrome (25999952).

The spelling of 23154820 in words is "twenty-three million, one hundred fifty-four thousand, eight hundred twenty".