20634469 has 2 divisors, whose sum is σ = 20634470. Its totient is φ = 20634468.

The previous prime is 20634461. The next prime is 20634479. The reversal of 20634469 is 96443602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20520900 + 113569 = 4530^2 + 337^2 .

It is a cyclic number.

It is not a de Polignac number, because 20634469 - 2³ = 20634461 is a prime.

It is a super-2 number, since 2×20634469² = 851562621823922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20634461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10317234 + 10317235.

It is an arithmetic number, because the mean of its divisors is an integer number (10317235).

Almost surely, 2^20634469 is an apocalyptic number.

It is an amenable number.

20634469 is a deficient number, since it is larger than the sum of its proper divisors (1).

20634469 is an equidigital number, since it uses as much as digits as its factorization.

20634469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 20634469 is about 4542.5179141089. The cubic root of 20634469 is about 274.2822893892.

The spelling of 20634469 in words is "twenty million, six hundred thirty-four thousand, four hundred sixty-nine".