20707669 has 2 divisors, whose sum is σ = 20707670. Its totient is φ = 20707668.

The previous prime is 20707651. The next prime is 20707681. The reversal of 20707669 is 96670702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13616100 + 7091569 = 3690^2 + 2663^2 .

It is a cyclic number.

It is not a de Polignac number, because 20707669 - 2⁹ = 20707157 is a prime.

It is a super-2 number, since 2×20707669² = 857615110827122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20707619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10353834 + 10353835.

It is an arithmetic number, because the mean of its divisors is an integer number (10353835).

Almost surely, 2^20707669 is an apocalyptic number.

It is an amenable number.

20707669 is a deficient number, since it is larger than the sum of its proper divisors (1).

20707669 is an equidigital number, since it uses as much as digits as its factorization.

20707669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 37.

The square root of 20707669 is about 4550.5679865265. The cubic root of 20707669 is about 274.6062419774.

The spelling of 20707669 in words is "twenty million, seven hundred seven thousand, six hundred sixty-nine".