28868125

素因数分解:

$5^4\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1$

素因数の和:80

約数の個数: 80

約数和(自身を含む): 47234880

約数和(自身を除く): 18366755

約数列:

[1, 5, 11, 13, 17, 19, 25, 55, 65, 85, 95, 125, 143, 187, 209, 221, 247, 275, 323, 325, 425, 475, 625, 715, 935, 1045, 1105, 1235, 1375, 1615, 1625, 2125, 2375, 2431, 2717, 3553, 3575, 4199, 4675, 5225, 5525, 6175, 6875, 8075, 8125, 10625, 11875, 12155, 13585, 17765, 17875, 20995, 23375, 26125, 27625, 30875, 40375, 46189, 60775, 67925, 88825, 89375, 104975, 116875, 130625, 138125, 154375, 201875, 230945, 303875, 339625, 444125, 524875, 1154725, 1519375, 1698125, 2220625, 2624375, 5773625, 28868125]

約数ペア:

[(1, 28868125), (5, 5773625), (11, 2624375), (13, 2220625), (17, 1698125), (19, 1519375), (25, 1154725), (55, 524875), (65, 444125), (85, 339625), (95, 303875), (125, 230945), (143, 201875), (187, 154375), (209, 138125), (221, 130625), (247, 116875), (275, 104975), (323, 89375), (325, 88825), (425, 67925), (475, 60775), (625, 46189), (715, 40375), (935, 30875), (1045, 27625), (1105, 26125), (1235, 23375), (1375, 20995), (1615, 17875), (1625, 17765), (2125, 13585), (2375, 12155), (2431, 11875), (2717, 10625), (3553, 8125), (3575, 8075), (4199, 6875), (4675, 6175), (5225, 5525)]