20350621 has 2 divisors, whose sum is σ = 20350622. Its totient is φ = 20350620.

The previous prime is 20350609. The next prime is 20350639. The reversal of 20350621 is 12605302.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16687225 + 3663396 = 4085^2 + 1914^2 .

It is a cyclic number.

It is not a de Polignac number, because 20350621 - 2⁷ = 20350493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20357621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10175310 + 10175311.

It is an arithmetic number, because the mean of its divisors is an integer number (10175311).

Almost surely, 2^20350621 is an apocalyptic number.

It is an amenable number.

20350621 is a deficient number, since it is larger than the sum of its proper divisors (1).

20350621 is an equidigital number, since it uses as much as digits as its factorization.

20350621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 20350621 is about 4511.1662571889. The cubic root of 20350621 is about 273.0188012294.

Adding to 20350621 its reverse (12605302), we get a palindrome (32955923).

The spelling of 20350621 in words is "twenty million, three hundred fifty thousand, six hundred twenty-one".