20707969 has 4 divisors (see below), whose sum is σ = 21376000. Its totient is φ = 20039940.

The previous prime is 20707963. The next prime is 20707979. The reversal of 20707969 is 96970702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96970702 = 2 ⋅48485351.

It is a cyclic number.

It is not a de Polignac number, because 20707969 - 2⁵ = 20707937 is a prime.

It is a super-2 number, since 2×20707969² = 857639960209922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20707963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333969 + ... + 334030.

It is an arithmetic number, because the mean of its divisors is an integer number (5344000).

Almost surely, 2^20707969 is an apocalyptic number.

It is an amenable number.

20707969 is a deficient number, since it is larger than the sum of its proper divisors (668031).

20707969 is an equidigital number, since it uses as much as digits as its factorization.

20707969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668030.

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 20707969 is about 4550.6009493253. The cubic root of 20707969 is about 274.6075680798.

The spelling of 20707969 in words is "twenty million, seven hundred seven thousand, nine hundred sixty-nine".