21123856

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{2477}}^1$

素因数の和:2539

約数の個数: 40

約数和(自身を含む): 45168984

約数和(自身を除く): 24045128

約数列:

[1, 2, 4, 8, 13, 16, 26, 41, 52, 82, 104, 164, 208, 328, 533, 656, 1066, 2132, 2477, 4264, 4954, 8528, 9908, 19816, 32201, 39632, 64402, 101557, 128804, 203114, 257608, 406228, 515216, 812456, 1320241, 1624912, 2640482, 5280964, 10561928, 21123856]

約数ペア:

[(1, 21123856), (2, 10561928), (4, 5280964), (8, 2640482), (13, 1624912), (16, 1320241), (26, 812456), (41, 515216), (52, 406228), (82, 257608), (104, 203114), (164, 128804), (208, 101557), (328, 64402), (533, 39632), (656, 32201), (1066, 19816), (2132, 9908), (2477, 8528), (4264, 4954)]