19917625

素因数分解:

$5^3\times 7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{103}}^1$

素因数の和:155

約数の個数: 64

約数和(自身を含む): 32707584

約数和(自身を除く): 12789959

約数列:

[1, 5, 7, 13, 17, 25, 35, 65, 85, 91, 103, 119, 125, 175, 221, 325, 425, 455, 515, 595, 721, 875, 1105, 1339, 1547, 1625, 1751, 2125, 2275, 2575, 2975, 3605, 5525, 6695, 7735, 8755, 9373, 11375, 12257, 12875, 14875, 18025, 22763, 27625, 33475, 38675, 43775, 46865, 61285, 90125, 113815, 159341, 167375, 193375, 218875, 234325, 306425, 569075, 796705, 1171625, 1532125, 2845375, 3983525, 19917625]

約数ペア:

[(1, 19917625), (5, 3983525), (7, 2845375), (13, 1532125), (17, 1171625), (25, 796705), (35, 569075), (65, 306425), (85, 234325), (91, 218875), (103, 193375), (119, 167375), (125, 159341), (175, 113815), (221, 90125), (325, 61285), (425, 46865), (455, 43775), (515, 38675), (595, 33475), (721, 27625), (875, 22763), (1105, 18025), (1339, 14875), (1547, 12875), (1625, 12257), (1751, 11375), (2125, 9373), (2275, 8755), (2575, 7735), (2975, 6695), (3605, 5525)]