20551413 has 4 divisors (see below), whose sum is σ = 27401888. Its totient is φ = 13700940.

The previous prime is 20551403. The next prime is 20551417. The reversal of 20551413 is 31415502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20551413 - 2¹³ = 20543221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20551413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20551417) 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, 3425233 + ... + 3425238.

It is an arithmetic number, because the mean of its divisors is an integer number (6850472).

Almost surely, 2^20551413 is an apocalyptic number.

It is an amenable number.

20551413 is a deficient number, since it is larger than the sum of its proper divisors (6850475).

20551413 is an equidigital number, since it uses as much as digits as its factorization.

20551413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6850474.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 20551413 is about 4533.3666297797. The cubic root of 20551413 is about 273.9137890994.

Adding to 20551413 its reverse (31415502), we get a palindrome (51966915).

The spelling of 20551413 in words is "twenty million, five hundred fifty-one thousand, four hundred thirteen".