20618241 has 16 divisors (see below), whose sum is σ = 31732608. Its totient is φ = 11664000.

The previous prime is 20618237. The next prime is 20618243. The reversal of 20618241 is 14281602.

It is not a de Polignac number, because 20618241 - 2² = 20618237 is a prime.

It is a super-2 number, since 2×20618241² = 850223723868162, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20618243) 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, 2740 + ... + 6981.

It is an arithmetic number, because the mean of its divisors is an integer number (1983288).

Almost surely, 2^20618241 is an apocalyptic number.

20618241 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20618241 is a deficient number, since it is larger than the sum of its proper divisors (11114367).

20618241 is a wasteful number, since it uses less digits than its factorization.

20618241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9832.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 20618241 is about 4540.7313287619. The cubic root of 20618241 is about 274.2103673325.

Adding to 20618241 its reverse (14281602), we get a palindrome (34899843).

The spelling of 20618241 in words is "twenty million, six hundred eighteen thousand, two hundred forty-one".