20609653 has 2 divisors, whose sum is σ = 20609654. Its totient is φ = 20609652.

The previous prime is 20609639. The next prime is 20609683. The reversal of 20609653 is 35690602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11135569 + 9474084 = 3337^2 + 3078^2 .

It is a cyclic number.

It is not a de Polignac number, because 20609653 - 2¹⁷ = 20478581 is a prime.

It is equal to p_1306759 and since 20609653 and 1306759 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20609683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10304826 + 10304827.

It is an arithmetic number, because the mean of its divisors is an integer number (10304827).

Almost surely, 2^20609653 is an apocalyptic number.

It is an amenable number.

20609653 is a deficient number, since it is larger than the sum of its proper divisors (1).

20609653 is an equidigital number, since it uses as much as digits as its factorization.

20609653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 20609653 is about 4539.7855676232. The cubic root of 20609653 is about 274.1722902778.

The spelling of 20609653 in words is "twenty million, six hundred nine thousand, six hundred fifty-three".