20510741 has 4 divisors (see below), whose sum is σ = 20596800. Its totient is φ = 20424684.

The previous prime is 20510729. The next prime is 20510759. The reversal of 20510741 is 14701502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20510741 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20510771) 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, 42671 + ... + 43148.

It is an arithmetic number, because the mean of its divisors is an integer number (5149200).

Almost surely, 2^20510741 is an apocalyptic number.

It is an amenable number.

20510741 is a deficient number, since it is larger than the sum of its proper divisors (86059).

20510741 is an equidigital number, since it uses as much as digits as its factorization.

20510741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86058.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 20510741 is about 4528.8785587604. The cubic root of 20510741 is about 273.7329746228.

The spelling of 20510741 in words is "twenty million, five hundred ten thousand, seven hundred forty-one".