21055005

素因数分解:

$3^3\times 5^1\times {\mathrm{23}}^1\times {\mathrm{6781}}^1$

素因数の和:6818

約数の個数: 32

約数和(自身を含む): 39064320

約数和(自身を除く): 18009315

約数列:

[1, 3, 5, 9, 15, 23, 27, 45, 69, 115, 135, 207, 345, 621, 1035, 3105, 6781, 20343, 33905, 61029, 101715, 155963, 183087, 305145, 467889, 779815, 915435, 1403667, 2339445, 4211001, 7018335, 21055005]

約数ペア:

[(1, 21055005), (3, 7018335), (5, 4211001), (9, 2339445), (15, 1403667), (23, 915435), (27, 779815), (45, 467889), (69, 305145), (115, 183087), (135, 155963), (207, 101715), (345, 61029), (621, 33905), (1035, 20343), (3105, 6781)]