20413533 has 16 divisors (see below), whose sum is σ = 31694976. Its totient is φ = 11444160.

The previous prime is 20413511. The next prime is 20413537. The reversal of 20413533 is 33531402.

It is not a de Polignac number, because 20413533 - 2⁹ = 20413021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20413537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8058 + ... + 10283.

It is an arithmetic number, because the mean of its divisors is an integer number (1980936).

Almost surely, 2^20413533 is an apocalyptic number.

It is an amenable number.

20413533 is a deficient number, since it is larger than the sum of its proper divisors (11281443).

20413533 is a wasteful number, since it uses less digits than its factorization.

20413533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18404.

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 20413533 is about 4518.1337961596. The cubic root of 20413533 is about 273.2998489949.

Adding to 20413533 its reverse (33531402), we get a palindrome (53944935).

The spelling of 20413533 in words is "twenty million, four hundred thirteen thousand, five hundred thirty-three".