20413523 has 4 divisors (see below), whose sum is σ = 21983808. Its totient is φ = 18843240.

The previous prime is 20413511. The next prime is 20413537. The reversal of 20413523 is 32531402.

It is a happy number.

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

It is not a de Polignac number, because 20413523 - 2¹⁰ = 20412499 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20413495 and 20413504.

It is not an unprimeable number, because it can be changed into a prime (20415523) 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, 785123 + ... + 785148.

It is an arithmetic number, because the mean of its divisors is an integer number (5495952).

Almost surely, 2^20413523 is an apocalyptic number.

20413523 is a deficient number, since it is larger than the sum of its proper divisors (1570285).

20413523 is a wasteful number, since it uses less digits than its factorization.

20413523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1570284.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20413523 is about 4518.1326895079. The cubic root of 20413523 is about 273.2998043677.

Adding to 20413523 its reverse (32531402), we get a palindrome (52944925).

The spelling of 20413523 in words is "twenty million, four hundred thirteen thousand, five hundred twenty-three".