21707475

素因数分解:

$3^1\times 5^2\times {\mathrm{43}}^1\times {\mathrm{53}}^1\times {\mathrm{127}}^1$

素因数の和:236

約数の個数: 48

約数和(自身を含む): 37711872

約数和(自身を除く): 16004397

約数列:

[1, 3, 5, 15, 25, 43, 53, 75, 127, 129, 159, 215, 265, 381, 635, 645, 795, 1075, 1325, 1905, 2279, 3175, 3225, 3975, 5461, 6731, 6837, 9525, 11395, 16383, 20193, 27305, 33655, 34185, 56975, 81915, 100965, 136525, 168275, 170925, 289433, 409575, 504825, 868299, 1447165, 4341495, 7235825, 21707475]

約数ペア:

[(1, 21707475), (3, 7235825), (5, 4341495), (15, 1447165), (25, 868299), (43, 504825), (53, 409575), (75, 289433), (127, 170925), (129, 168275), (159, 136525), (215, 100965), (265, 81915), (381, 56975), (635, 34185), (645, 33655), (795, 27305), (1075, 20193), (1325, 16383), (1905, 11395), (2279, 9525), (3175, 6837), (3225, 6731), (3975, 5461)]