21000994580

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{211}}^1\times {\mathrm{121379}}^1$

素因数の和:121640

約数の個数: 48

約数和(自身を含む): 45392235840

約数和(自身を除く): 24391241260

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 211, 410, 422, 820, 844, 1055, 2110, 4220, 8651, 17302, 34604, 43255, 86510, 121379, 173020, 242758, 485516, 606895, 1213790, 2427580, 4976539, 9953078, 19906156, 24882695, 25610969, 49765390, 51221938, 99530780, 102443876, 128054845, 256109690, 512219380, 1050049729, 2100099458, 4200198916, 5250248645, 10500497290, 21000994580]

約数ペア:

[(1, 21000994580), (2, 10500497290), (4, 5250248645), (5, 4200198916), (10, 2100099458), (20, 1050049729), (41, 512219380), (82, 256109690), (164, 128054845), (205, 102443876), (211, 99530780), (410, 51221938), (422, 49765390), (820, 25610969), (844, 24882695), (1055, 19906156), (2110, 9953078), (4220, 4976539), (8651, 2427580), (17302, 1213790), (34604, 606895), (43255, 485516), (86510, 242758), (121379, 173020)]