20243181 has 16 divisors (see below), whose sum is σ = 31681664. Its totient is φ = 11254464.

The previous prime is 20243177. The next prime is 20243203. The reversal of 20243181 is 18134202.

It is not a de Polignac number, because 20243181 - 2² = 20243177 is a prime.

It is a super-2 number, since 2×20243181² = 819572753997522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20243101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12250 + ... + 13803.

It is an arithmetic number, because the mean of its divisors is an integer number (1980104).

Almost surely, 2^20243181 is an apocalyptic number.

20243181 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20243181 is a deficient number, since it is larger than the sum of its proper divisors (11438483).

20243181 is a wasteful number, since it uses less digits than its factorization.

20243181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26100.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 20243181 is about 4499.2422695383. The cubic root of 20243181 is about 272.5374905633.

Adding to 20243181 its reverse (18134202), we get a palindrome (38377383).

The spelling of 20243181 in words is "twenty million, two hundred forty-three thousand, one hundred eighty-one".