21020925

素因数分解:

$3^1\times 5^2\times {\mathrm{17}}^1\times {\mathrm{16487}}^1$

素因数の和:16517

約数の個数: 24

約数和(自身を含む): 36801216

約数和(自身を除く): 15780291

約数列:

[1, 3, 5, 15, 17, 25, 51, 75, 85, 255, 425, 1275, 16487, 49461, 82435, 247305, 280279, 412175, 840837, 1236525, 1401395, 4204185, 7006975, 21020925]

約数ペア:

[(1, 21020925), (3, 7006975), (5, 4204185), (15, 1401395), (17, 1236525), (25, 840837), (51, 412175), (75, 280279), (85, 247305), (255, 82435), (425, 49461), (1275, 16487)]