20193875

素因数分解:

$5^3\times {\mathrm{13}}^1\times {\mathrm{17}}^2\times {\mathrm{43}}^1$

素因数の和:105

約数の個数: 48

約数和(自身を含む): 29501472

約数和(自身を除く): 9307597

約数列:

[1, 5, 13, 17, 25, 43, 65, 85, 125, 215, 221, 289, 325, 425, 559, 731, 1075, 1105, 1445, 1625, 2125, 2795, 3655, 3757, 5375, 5525, 7225, 9503, 12427, 13975, 18275, 18785, 27625, 36125, 47515, 62135, 69875, 91375, 93925, 161551, 237575, 310675, 469625, 807755, 1187875, 1553375, 4038775, 20193875]

約数ペア:

[(1, 20193875), (5, 4038775), (13, 1553375), (17, 1187875), (25, 807755), (43, 469625), (65, 310675), (85, 237575), (125, 161551), (215, 93925), (221, 91375), (289, 69875), (325, 62135), (425, 47515), (559, 36125), (731, 27625), (1075, 18785), (1105, 18275), (1445, 13975), (1625, 12427), (2125, 9503), (2795, 7225), (3655, 5525), (3757, 5375)]