21181960

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{47}}^1\times {\mathrm{593}}^1$

素因数の和:670

約数の個数: 64

約数和(自身を含む): 51321600

約数和(自身を除く): 30139640

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 47, 76, 94, 95, 152, 188, 190, 235, 376, 380, 470, 593, 760, 893, 940, 1186, 1786, 1880, 2372, 2965, 3572, 4465, 4744, 5930, 7144, 8930, 11267, 11860, 17860, 22534, 23720, 27871, 35720, 45068, 55742, 56335, 90136, 111484, 112670, 139355, 222968, 225340, 278710, 450680, 529549, 557420, 1059098, 1114840, 2118196, 2647745, 4236392, 5295490, 10590980, 21181960]

約数ペア:

[(1, 21181960), (2, 10590980), (4, 5295490), (5, 4236392), (8, 2647745), (10, 2118196), (19, 1114840), (20, 1059098), (38, 557420), (40, 529549), (47, 450680), (76, 278710), (94, 225340), (95, 222968), (152, 139355), (188, 112670), (190, 111484), (235, 90136), (376, 56335), (380, 55742), (470, 45068), (593, 35720), (760, 27871), (893, 23720), (940, 22534), (1186, 17860), (1786, 11860), (1880, 11267), (2372, 8930), (2965, 7144), (3572, 5930), (4465, 4744)]