21591375

素因数分解:

$3^1\times 5^3\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{103}}^1$

素因数の和:177

約数の個数: 64

約数和(自身を含む): 39975936

約数和(自身を除く): 18384561

約数列:

[1, 3, 5, 13, 15, 25, 39, 43, 65, 75, 103, 125, 129, 195, 215, 309, 325, 375, 515, 559, 645, 975, 1075, 1339, 1545, 1625, 1677, 2575, 2795, 3225, 4017, 4429, 4875, 5375, 6695, 7725, 8385, 12875, 13287, 13975, 16125, 20085, 22145, 33475, 38625, 41925, 57577, 66435, 69875, 100425, 110725, 167375, 172731, 209625, 287885, 332175, 502125, 553625, 863655, 1439425, 1660875, 4318275, 7197125, 21591375]

約数ペア:

[(1, 21591375), (3, 7197125), (5, 4318275), (13, 1660875), (15, 1439425), (25, 863655), (39, 553625), (43, 502125), (65, 332175), (75, 287885), (103, 209625), (125, 172731), (129, 167375), (195, 110725), (215, 100425), (309, 69875), (325, 66435), (375, 57577), (515, 41925), (559, 38625), (645, 33475), (975, 22145), (1075, 20085), (1339, 16125), (1545, 13975), (1625, 13287), (1677, 12875), (2575, 8385), (2795, 7725), (3225, 6695), (4017, 5375), (4429, 4875)]