1620221026 has 16 divisors (see below), whose sum is σ = 2495574648. Its totient is φ = 788457600.

The previous prime is 1620221011. The next prime is 1620221027. The reversal of 1620221026 is 6201220261.

It can be written as a sum of positive squares in 4 ways, for example, as 91489225 + 1528731801 = 9565^2 + 39099^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1620220988 and 1620221006.

It is not an unprimeable number, because it can be changed into a prime (1620221027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11056 + ... + 57988.

Almost surely, 2^1620221026 is an apocalyptic number.

1620221026 is a deficient number, since it is larger than the sum of its proper divisors (875353622).

1620221026 is a wasteful number, since it uses less digits than its factorization.

1620221026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47397.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1620221026 is about 40251.9692189090. The cubic root of 1620221026 is about 1174.5137027325.

Adding to 1620221026 its reverse (6201220261), we get a palindrome (7821441287).

The spelling of 1620221026 in words is "one billion, six hundred twenty million, two hundred twenty-one thousand, twenty-six".