20509041 has 8 divisors (see below), whose sum is σ = 31251904. Its totient is φ = 11719440.

The previous prime is 20508997. The next prime is 20509057. The reversal of 20509041 is 14090502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20509041 - 2⁷ = 20508913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 976621 = 20509041 / (2 + 0 + 5 + 0 + 9 + 0 + 4 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20508999 and 20509017.

It is not an unprimeable number, because it can be changed into a prime (20509081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 488290 + ... + 488331.

It is an arithmetic number, because the mean of its divisors is an integer number (3906488).

Almost surely, 2^20509041 is an apocalyptic number.

20509041 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20509041 is a deficient number, since it is larger than the sum of its proper divisors (10742863).

20509041 is an equidigital number, since it uses as much as digits as its factorization.

20509041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976631.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 20509041 is about 4528.6908704393. The cubic root of 20509041 is about 273.7254117737.

Adding to 20509041 its reverse (14090502), we get a palindrome (34599543).

The spelling of 20509041 in words is "twenty million, five hundred nine thousand, forty-one".