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20553413 = 32176389
BaseRepresentation
bin100111001100…
…1111011000101
31102200012222112
41032121323011
520230202123
62012310405
7336462326
oct116317305
942605875
1020553413
11106690a1
126a72405
1343482aa
142a3044d
151c0ed78
hex1399ec5

20553413 has 4 divisors (see below), whose sum is σ = 20563020. Its totient is φ = 20543808.

The previous prime is 20553361. The next prime is 20553433. The reversal of 20553413 is 31435502.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7579009 + 12974404 = 2753^2 + 3602^2 .

It is a cyclic number.

It is not a de Polignac number, because 20553413 - 214 = 20537029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20553433) 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, 23 + ... + 6411.

It is an arithmetic number, because the mean of its divisors is an integer number (5140755).

Almost surely, 220553413 is an apocalyptic number.

It is an amenable number.

20553413 is a deficient number, since it is larger than the sum of its proper divisors (9607).

20553413 is an equidigital number, since it uses as much as digits as its factorization.

20553413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9606.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 20553413 is about 4533.5872110284. The cubic root of 20553413 is about 273.9226742923.

Adding to 20553413 its reverse (31435502), we get a palindrome (51988915).

The spelling of 20553413 in words is "twenty million, five hundred fifty-three thousand, four hundred thirteen".

Divisors: 1 3217 6389 20553413