20815640

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{61}}^1\times {\mathrm{449}}^1$

素因数の和:540

約数の個数: 64

約数和(自身を含む): 50220000

約数和(自身を除く): 29404360

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 61, 76, 95, 122, 152, 190, 244, 305, 380, 449, 488, 610, 760, 898, 1159, 1220, 1796, 2245, 2318, 2440, 3592, 4490, 4636, 5795, 8531, 8980, 9272, 11590, 17062, 17960, 23180, 27389, 34124, 42655, 46360, 54778, 68248, 85310, 109556, 136945, 170620, 219112, 273890, 341240, 520391, 547780, 1040782, 1095560, 2081564, 2601955, 4163128, 5203910, 10407820, 20815640]

約数ペア:

[(1, 20815640), (2, 10407820), (4, 5203910), (5, 4163128), (8, 2601955), (10, 2081564), (19, 1095560), (20, 1040782), (38, 547780), (40, 520391), (61, 341240), (76, 273890), (95, 219112), (122, 170620), (152, 136945), (190, 109556), (244, 85310), (305, 68248), (380, 54778), (449, 46360), (488, 42655), (610, 34124), (760, 27389), (898, 23180), (1159, 17960), (1220, 17062), (1796, 11590), (2245, 9272), (2318, 8980), (2440, 8531), (3592, 5795), (4490, 4636)]