19995975

素因数分解:

$3^2\times 5^2\times {\mathrm{181}}^1\times {\mathrm{491}}^1$

素因数の和:688

約数の個数: 36

約数和(自身を含む): 36086232

約数和(自身を除く): 16090257

約数列:

[1, 3, 5, 9, 15, 25, 45, 75, 181, 225, 491, 543, 905, 1473, 1629, 2455, 2715, 4419, 4525, 7365, 8145, 12275, 13575, 22095, 36825, 40725, 88871, 110475, 266613, 444355, 799839, 1333065, 2221775, 3999195, 6665325, 19995975]

約数ペア:

[(1, 19995975), (3, 6665325), (5, 3999195), (9, 2221775), (15, 1333065), (25, 799839), (45, 444355), (75, 266613), (181, 110475), (225, 88871), (491, 40725), (543, 36825), (905, 22095), (1473, 13575), (1629, 12275), (2455, 8145), (2715, 7365), (4419, 4525)]