20757241 has 4 divisors (see below), whose sum is σ = 20781684. Its totient is φ = 20732800.

The previous prime is 20757229. The next prime is 20757257. The reversal of 20757241 is 14275702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3980025 + 16777216 = 1995^2 + 4096^2 .

It is a cyclic number.

It is not a de Polignac number, because 20757241 - 2²³ = 12368633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20757641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10900 + ... + 12661.

It is an arithmetic number, because the mean of its divisors is an integer number (5195421).

Almost surely, 2^20757241 is an apocalyptic number.

It is an amenable number.

20757241 is a deficient number, since it is larger than the sum of its proper divisors (24443).

20757241 is an equidigital number, since it uses as much as digits as its factorization.

20757241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24442.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 20757241 is about 4556.0115232515. The cubic root of 20757241 is about 274.8251935894.

It can be divided in two parts, 2075 and 7241, that added together give a triangular number (9316 = T₁₃₆).

The spelling of 20757241 in words is "twenty million, seven hundred fifty-seven thousand, two hundred forty-one".