23155380 has 72 divisors (see below), whose sum is σ = 70702632. Its totient is φ = 6134016.

The previous prime is 23155373. The next prime is 23155463. The reversal of 23155380 is 8355132.

23155380 is a `hidden beast` number, since 2 + 31 + 553 + 80 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5363856 + 17791524 = 2316^2 + 4218^2 .

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 23 ways as a sum of consecutive naturals, for example, 35134 + ... + 35786.

It is an arithmetic number, because the mean of its divisors is an integer number (981981).

Almost surely, 2^23155380 is an apocalyptic number.

23155380 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 23155380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35351316).

23155380 is an abundant number, since it is smaller than the sum of its proper divisors (47547252).

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

23155380 is a wasteful number, since it uses less digits than its factorization.

23155380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865 (or 860 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 23155380 is about 4812.0037406469. The cubic root of 23155380 is about 285.0256671251.

It can be divided in two parts, 231 and 55380, that added together give a triangular number (55611 = T₃₃₃).

The spelling of 23155380 in words is "twenty-three million, one hundred fifty-five thousand, three hundred eighty".