181541020 has 24 divisors (see below), whose sum is σ = 381903984. Its totient is φ = 72489216.

The previous prime is 181540951. The next prime is 181541023. The reversal of 181541020 is 20145181.

It is a junction number, because it is equal to n+sod(n) for n = 181540982 and 181541000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181541023) 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, 4207 + ... + 19513.

It is an arithmetic number, because the mean of its divisors is an integer number (15912666).

Almost surely, 2^181541020 is an apocalyptic number.

181541020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181541020 is an abundant number, since it is smaller than the sum of its proper divisors (200362964).

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

181541020 is a wasteful number, since it uses less digits than its factorization.

181541020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15909 (or 15907 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 181541020 is about 13473.7158942884. The cubic root of 181541020 is about 566.2283246011.

The spelling of 181541020 in words is "one hundred eighty-one million, five hundred forty-one thousand, twenty".