21268125

素因数分解:

$3^2\times 5^4\times {\mathrm{19}}^1\times {\mathrm{199}}^1$

素因数の和:244

約数の個数: 60

約数和(自身を含む): 40612000

約数和(自身を除く): 19343875

約数列:

[1, 3, 5, 9, 15, 19, 25, 45, 57, 75, 95, 125, 171, 199, 225, 285, 375, 475, 597, 625, 855, 995, 1125, 1425, 1791, 1875, 2375, 2985, 3781, 4275, 4975, 5625, 7125, 8955, 11343, 11875, 14925, 18905, 21375, 24875, 34029, 35625, 44775, 56715, 74625, 94525, 106875, 124375, 170145, 223875, 283575, 373125, 472625, 850725, 1119375, 1417875, 2363125, 4253625, 7089375, 21268125]

約数ペア:

[(1, 21268125), (3, 7089375), (5, 4253625), (9, 2363125), (15, 1417875), (19, 1119375), (25, 850725), (45, 472625), (57, 373125), (75, 283575), (95, 223875), (125, 170145), (171, 124375), (199, 106875), (225, 94525), (285, 74625), (375, 56715), (475, 44775), (597, 35625), (625, 34029), (855, 24875), (995, 21375), (1125, 18905), (1425, 14925), (1791, 11875), (1875, 11343), (2375, 8955), (2985, 7125), (3781, 5625), (4275, 4975)]