18878925

素因数分解:

$3^1\times 5^2\times {\mathrm{13}}^1\times {\mathrm{17}}^2\times {\mathrm{67}}^1$

素因数の和:127

約数の個数: 72

約数和(自身を含む): 36240736

約数和(自身を除く): 17361811

約数列:

[1, 3, 5, 13, 15, 17, 25, 39, 51, 65, 67, 75, 85, 195, 201, 221, 255, 289, 325, 335, 425, 663, 867, 871, 975, 1005, 1105, 1139, 1275, 1445, 1675, 2613, 3315, 3417, 3757, 4335, 4355, 5025, 5525, 5695, 7225, 11271, 13065, 14807, 16575, 17085, 18785, 19363, 21675, 21775, 28475, 44421, 56355, 58089, 65325, 74035, 85425, 93925, 96815, 222105, 251719, 281775, 290445, 370175, 484075, 755157, 1110525, 1258595, 1452225, 3775785, 6292975, 18878925]

約数ペア:

[(1, 18878925), (3, 6292975), (5, 3775785), (13, 1452225), (15, 1258595), (17, 1110525), (25, 755157), (39, 484075), (51, 370175), (65, 290445), (67, 281775), (75, 251719), (85, 222105), (195, 96815), (201, 93925), (221, 85425), (255, 74035), (289, 65325), (325, 58089), (335, 56355), (425, 44421), (663, 28475), (867, 21775), (871, 21675), (975, 19363), (1005, 18785), (1105, 17085), (1139, 16575), (1275, 14807), (1445, 13065), (1675, 11271), (2613, 7225), (3315, 5695), (3417, 5525), (3757, 5025), (4335, 4355)]