21128556

素因数分解:

$2^2\times 3^1\times {\mathrm{53}}^1\times {\mathrm{139}}^1\times {\mathrm{239}}^1$

素因数の和:438

約数の個数: 48

約数和(自身を含む): 50803200

約数和(自身を除く): 29674644

約数列:

[1, 2, 3, 4, 6, 12, 53, 106, 139, 159, 212, 239, 278, 318, 417, 478, 556, 636, 717, 834, 956, 1434, 1668, 2868, 7367, 12667, 14734, 22101, 25334, 29468, 33221, 38001, 44202, 50668, 66442, 76002, 88404, 99663, 132884, 152004, 199326, 398652, 1760713, 3521426, 5282139, 7042852, 10564278, 21128556]

約数ペア:

[(1, 21128556), (2, 10564278), (3, 7042852), (4, 5282139), (6, 3521426), (12, 1760713), (53, 398652), (106, 199326), (139, 152004), (159, 132884), (212, 99663), (239, 88404), (278, 76002), (318, 66442), (417, 50668), (478, 44202), (556, 38001), (636, 33221), (717, 29468), (834, 25334), (956, 22101), (1434, 14734), (1668, 12667), (2868, 7367)]