20655469 has 2 divisors, whose sum is σ = 20655470. Its totient is φ = 20655468.

The previous prime is 20655457. The next prime is 20655473. The reversal of 20655469 is 96455602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12888100 + 7767369 = 3590^2 + 2787^2 .

It is a cyclic number.

It is not a de Polignac number, because 20655469 - 2¹¹ = 20653421 is a prime.

It is a super-2 number, since 2×20655469² = 853296799219922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20655169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10327734 + 10327735.

It is an arithmetic number, because the mean of its divisors is an integer number (10327735).

Almost surely, 2^20655469 is an apocalyptic number.

It is an amenable number.

20655469 is a deficient number, since it is larger than the sum of its proper divisors (1).

20655469 is an equidigital number, since it uses as much as digits as its factorization.

20655469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 20655469 is about 4544.8288196587. The cubic root of 20655469 is about 274.3753048704.

The spelling of 20655469 in words is "twenty million, six hundred fifty-five thousand, four hundred sixty-nine".