20647453 has 2 divisors, whose sum is σ = 20647454. Its totient is φ = 20647452.

The previous prime is 20647447. The next prime is 20647489. The reversal of 20647453 is 35474602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20629764 + 17689 = 4542^2 + 133^2 .

It is a cyclic number.

It is not a de Polignac number, because 20647453 - 2¹³ = 20639261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20647493) 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, 10323726 + 10323727.

It is an arithmetic number, because the mean of its divisors is an integer number (10323727).

Almost surely, 2^20647453 is an apocalyptic number.

It is an amenable number.

20647453 is a deficient number, since it is larger than the sum of its proper divisors (1).

20647453 is an equidigital number, since it uses as much as digits as its factorization.

20647453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 31.

The square root of 20647453 is about 4543.9468526821. The cubic root of 20647453 is about 274.3398069753.

The spelling of 20647453 in words is "twenty million, six hundred forty-seven thousand, four hundred fifty-three".