20539413 has 10 divisors (see below), whose sum is σ = 30682454. Its totient is φ = 13692888.

The previous prime is 20539411. The next prime is 20539427. The reversal of 20539413 is 31493502.

It can be written as a sum of positive squares in only one way, i.e., 17363889 + 3175524 = 4167^2 + 1782^2 .

It is not a de Polignac number, because 20539413 - 2¹ = 20539411 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20539411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 126706 + ... + 126867.

Almost surely, 2^20539413 is an apocalyptic number.

It is an amenable number.

20539413 is a deficient number, since it is larger than the sum of its proper divisors (10143041).

20539413 is an equidigital number, since it uses as much as digits as its factorization.

20539413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253585 (or 253576 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 20539413 is about 4532.0429168312. The cubic root of 20539413 is about 273.8604658326.

The spelling of 20539413 in words is "twenty million, five hundred thirty-nine thousand, four hundred thirteen".