20991661120

素因数分解:

$2^6\times 5^1\times {\mathrm{2521}}^1\times {\mathrm{26021}}^1$

素因数の和:28559

約数の個数: 56

約数和(自身を含む): 50008142808

約数和(自身を除く): 29016481688

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 320, 2521, 5042, 10084, 12605, 20168, 25210, 26021, 40336, 50420, 52042, 80672, 100840, 104084, 130105, 161344, 201680, 208168, 260210, 403360, 416336, 520420, 806720, 832672, 1040840, 1665344, 2081680, 4163360, 8326720, 65598941, 131197882, 262395764, 327994705, 524791528, 655989410, 1049583056, 1311978820, 2099166112, 2623957640, 4198332224, 5247915280, 10495830560, 20991661120]

約数ペア:

[(1, 20991661120), (2, 10495830560), (4, 5247915280), (5, 4198332224), (8, 2623957640), (10, 2099166112), (16, 1311978820), (20, 1049583056), (32, 655989410), (40, 524791528), (64, 327994705), (80, 262395764), (160, 131197882), (320, 65598941), (2521, 8326720), (5042, 4163360), (10084, 2081680), (12605, 1665344), (20168, 1040840), (25210, 832672), (26021, 806720), (40336, 520420), (50420, 416336), (52042, 403360), (80672, 260210), (100840, 208168), (104084, 201680), (130105, 161344)]