23351540 has 48 divisors (see below), whose sum is σ = 52354512. Its totient is φ = 8718336.

The previous prime is 23351539. The next prime is 23351561. The reversal of 23351540 is 4515332.

It can be written as a sum of positive squares in 8 ways, for example, as 3602404 + 19749136 = 1898^2 + 4444^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58622 + ... + 59018.

It is an arithmetic number, because the mean of its divisors is an integer number (1090719).

Almost surely, 2^23351540 is an apocalyptic number.

23351540 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 23351540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26177256).

23351540 is an abundant number, since it is smaller than the sum of its proper divisors (29002972).

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

23351540 is a wasteful number, since it uses less digits than its factorization.

23351540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596 (or 594 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 23351540 is about 4832.3431169568. The cubic root of 23351540 is about 285.8282666660.

Adding to 23351540 its reverse (4515332), we get a palindrome (27866872).

The spelling of 23351540 in words is "twenty-three million, three hundred fifty-one thousand, five hundred forty".