20985880

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{53}}^1\times {\mathrm{521}}^1$

素因数の和:604

約数の個数: 64

約数和(自身を含む): 50738400

約数和(自身を除く): 29752520

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 53, 76, 95, 106, 152, 190, 212, 265, 380, 424, 521, 530, 760, 1007, 1042, 1060, 2014, 2084, 2120, 2605, 4028, 4168, 5035, 5210, 8056, 9899, 10070, 10420, 19798, 20140, 20840, 27613, 39596, 40280, 49495, 55226, 79192, 98990, 110452, 138065, 197980, 220904, 276130, 395960, 524647, 552260, 1049294, 1104520, 2098588, 2623235, 4197176, 5246470, 10492940, 20985880]

約数ペア:

[(1, 20985880), (2, 10492940), (4, 5246470), (5, 4197176), (8, 2623235), (10, 2098588), (19, 1104520), (20, 1049294), (38, 552260), (40, 524647), (53, 395960), (76, 276130), (95, 220904), (106, 197980), (152, 138065), (190, 110452), (212, 98990), (265, 79192), (380, 55226), (424, 49495), (521, 40280), (530, 39596), (760, 27613), (1007, 20840), (1042, 20140), (1060, 19798), (2014, 10420), (2084, 10070), (2120, 9899), (2605, 8056), (4028, 5210), (4168, 5035)]