20681241 has 16 divisors (see below), whose sum is σ = 31694208. Its totient is φ = 11750400.

The previous prime is 20681239. The next prime is 20681249. The reversal of 20681241 is 14218602.

It is not a de Polignac number, because 20681241 - 2¹ = 20681239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20681249) 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, 1081 + ... + 6521.

It is an arithmetic number, because the mean of its divisors is an integer number (1980888).

Almost surely, 2^20681241 is an apocalyptic number.

20681241 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20681241 is a deficient number, since it is larger than the sum of its proper divisors (11012967).

20681241 is a wasteful number, since it uses less digits than its factorization.

20681241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5632.

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

The square root of 20681241 is about 4547.6632461078. The cubic root of 20681241 is about 274.4893708911.

Adding to 20681241 its reverse (14218602), we get a palindrome (34899843).

The spelling of 20681241 in words is "twenty million, six hundred eighty-one thousand, two hundred forty-one".