21248235

素因数分解:

$3^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{79}}^1\times {\mathrm{139}}^1$

素因数の和:272

約数の個数: 48

約数和(自身を含む): 38438400

約数和(自身を除く): 17190165

約数列:

[1, 3, 5, 9, 15, 43, 45, 79, 129, 139, 215, 237, 387, 395, 417, 645, 695, 711, 1185, 1251, 1935, 2085, 3397, 3555, 5977, 6255, 10191, 10981, 16985, 17931, 29885, 30573, 32943, 50955, 53793, 54905, 89655, 98829, 152865, 164715, 268965, 472183, 494145, 1416549, 2360915, 4249647, 7082745, 21248235]

約数ペア:

[(1, 21248235), (3, 7082745), (5, 4249647), (9, 2360915), (15, 1416549), (43, 494145), (45, 472183), (79, 268965), (129, 164715), (139, 152865), (215, 98829), (237, 89655), (387, 54905), (395, 53793), (417, 50955), (645, 32943), (695, 30573), (711, 29885), (1185, 17931), (1251, 16985), (1935, 10981), (2085, 10191), (3397, 6255), (3555, 5977)]