1620200105 has 4 divisors (see below), whose sum is σ = 1944240132. Its totient is φ = 1296160080.

The previous prime is 1620200051. The next prime is 1620200117. The reversal of 1620200105 is 5010020261.

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

It can be written as a sum of positive squares in 2 ways, for example, as 502835776 + 1117364329 = 22424^2 + 33427^2 .

It is not a de Polignac number, because 1620200105 - 2⁶ = 1620200041 is a prime.

It is a super-4 number, since 4×1620200105⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162020006 + ... + 162020015.

It is an arithmetic number, because the mean of its divisors is an integer number (486060033).

Almost surely, 2^1620200105 is an apocalyptic number.

It is an amenable number.

1620200105 is a deficient number, since it is larger than the sum of its proper divisors (324040027).

1620200105 is an equidigital number, since it uses as much as digits as its factorization.

1620200105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324040026.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1620200105 is about 40251.7093425857. The cubic root of 1620200105 is about 1174.5086474332.

Adding to 1620200105 its reverse (5010020261), we get a palindrome (6630220366).

The spelling of 1620200105 in words is "one billion, six hundred twenty million, two hundred thousand, one hundred five".