20650501 has 2 divisors, whose sum is σ = 20650502. Its totient is φ = 20650500.

The previous prime is 20650499. The next prime is 20650507. The reversal of 20650501 is 10505602.

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., 14025025 + 6625476 = 3745^2 + 2574^2 .

It is a cyclic number.

It is not a de Polignac number, because 20650501 - 2¹ = 20650499 is a prime.

Together with 20650499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20650507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10325250 + 10325251.

It is an arithmetic number, because the mean of its divisors is an integer number (10325251).

Almost surely, 2^20650501 is an apocalyptic number.

It is an amenable number.

20650501 is a deficient number, since it is larger than the sum of its proper divisors (1).

20650501 is an equidigital number, since it uses as much as digits as its factorization.

20650501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 20650501 is about 4544.2822315521. The cubic root of 20650501 is about 274.3533057603.

The spelling of 20650501 in words is "twenty million, six hundred fifty thousand, five hundred one".