20930269 has 2 divisors, whose sum is σ = 20930270. Its totient is φ = 20930268.

The previous prime is 20930251. The next prime is 20930317. The reversal of 20930269 is 96203902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20884900 + 45369 = 4570^2 + 213^2 .

It is a cyclic number.

It is not a de Polignac number, because 20930269 - 2²¹ = 18833117 is a prime.

It is a super-2 number, since 2×20930269² = 876152320824722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20930269.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20930209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10465134 + 10465135.

It is an arithmetic number, because the mean of its divisors is an integer number (10465135).

Almost surely, 2^20930269 is an apocalyptic number.

It is an amenable number.

20930269 is a deficient number, since it is larger than the sum of its proper divisors (1).

20930269 is an equidigital number, since it uses as much as digits as its factorization.

20930269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 20930269 is about 4574.9610927307. The cubic root of 20930269 is about 275.5867099042.

The spelling of 20930269 in words is "twenty million, nine hundred thirty thousand, two hundred sixty-nine".