21031975

素因数分解:

$5^2\times {\mathrm{17}}^2\times {\mathrm{41}}^1\times {\mathrm{71}}^1$

素因数の和:156

約数の個数: 36

約数和(自身を含む): 28779408

約数和(自身を除く): 7747433

約数列:

[1, 5, 17, 25, 41, 71, 85, 205, 289, 355, 425, 697, 1025, 1207, 1445, 1775, 2911, 3485, 6035, 7225, 11849, 14555, 17425, 20519, 30175, 49487, 59245, 72775, 102595, 247435, 296225, 512975, 841279, 1237175, 4206395, 21031975]

約数ペア:

[(1, 21031975), (5, 4206395), (17, 1237175), (25, 841279), (41, 512975), (71, 296225), (85, 247435), (205, 102595), (289, 72775), (355, 59245), (425, 49487), (697, 30175), (1025, 20519), (1207, 17425), (1445, 14555), (1775, 11849), (2911, 7225), (3485, 6035)]