21000887980

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{2521}}^1\times {\mathrm{10159}}^1$

素因数の和:12730

約数の個数: 48

約数和(自身を含む): 45199889280

約数和(自身を除く): 24199001300

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 2521, 5042, 10084, 10159, 12605, 20318, 25210, 40636, 50420, 50795, 101590, 103361, 203180, 206722, 413444, 416519, 516805, 833038, 1033610, 1666076, 2067220, 2082595, 4165190, 8330380, 25610839, 51221678, 102443356, 128054195, 256108390, 512216780, 1050044399, 2100088798, 4200177596, 5250221995, 10500443990, 21000887980]

約数ペア:

[(1, 21000887980), (2, 10500443990), (4, 5250221995), (5, 4200177596), (10, 2100088798), (20, 1050044399), (41, 512216780), (82, 256108390), (164, 128054195), (205, 102443356), (410, 51221678), (820, 25610839), (2521, 8330380), (5042, 4165190), (10084, 2082595), (10159, 2067220), (12605, 1666076), (20318, 1033610), (25210, 833038), (40636, 516805), (50420, 416519), (50795, 413444), (101590, 206722), (103361, 203180)]