21660680

素因数分解:

$2^3\times 5^1\times {\mathrm{29}}^1\times {\mathrm{71}}^1\times {\mathrm{263}}^1$

素因数の和:374

約数の個数: 64

約数和(自身を含む): 51321600

約数和(自身を除く): 29660920

約数列:

[1, 2, 4, 5, 8, 10, 20, 29, 40, 58, 71, 116, 142, 145, 232, 263, 284, 290, 355, 526, 568, 580, 710, 1052, 1160, 1315, 1420, 2059, 2104, 2630, 2840, 4118, 5260, 7627, 8236, 10295, 10520, 15254, 16472, 18673, 20590, 30508, 37346, 38135, 41180, 61016, 74692, 76270, 82360, 93365, 149384, 152540, 186730, 305080, 373460, 541517, 746920, 1083034, 2166068, 2707585, 4332136, 5415170, 10830340, 21660680]

約数ペア:

[(1, 21660680), (2, 10830340), (4, 5415170), (5, 4332136), (8, 2707585), (10, 2166068), (20, 1083034), (29, 746920), (40, 541517), (58, 373460), (71, 305080), (116, 186730), (142, 152540), (145, 149384), (232, 93365), (263, 82360), (284, 76270), (290, 74692), (355, 61016), (526, 41180), (568, 38135), (580, 37346), (710, 30508), (1052, 20590), (1160, 18673), (1315, 16472), (1420, 15254), (2059, 10520), (2104, 10295), (2630, 8236), (2840, 7627), (4118, 5260)]