21121540

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{163}}^1$

素因数の和:233

約数の個数: 96

約数和(自身を含む): 52899840

約数和(自身を除く): 31778300

約数列:

[1, 2, 4, 5, 10, 11, 19, 20, 22, 31, 38, 44, 55, 62, 76, 95, 110, 124, 155, 163, 190, 209, 220, 310, 326, 341, 380, 418, 589, 620, 652, 682, 815, 836, 1045, 1178, 1364, 1630, 1705, 1793, 2090, 2356, 2945, 3097, 3260, 3410, 3586, 4180, 5053, 5890, 6194, 6479, 6820, 7172, 8965, 10106, 11780, 12388, 12958, 15485, 17930, 20212, 25265, 25916, 30970, 32395, 34067, 35860, 50530, 55583, 61940, 64790, 68134, 96007, 101060, 111166, 129580, 136268, 170335, 192014, 222332, 277915, 340670, 384028, 480035, 555830, 681340, 960070, 1056077, 1111660, 1920140, 2112154, 4224308, 5280385, 10560770, 21121540]

約数ペア:

[(1, 21121540), (2, 10560770), (4, 5280385), (5, 4224308), (10, 2112154), (11, 1920140), (19, 1111660), (20, 1056077), (22, 960070), (31, 681340), (38, 555830), (44, 480035), (55, 384028), (62, 340670), (76, 277915), (95, 222332), (110, 192014), (124, 170335), (155, 136268), (163, 129580), (190, 111166), (209, 101060), (220, 96007), (310, 68134), (326, 64790), (341, 61940), (380, 55583), (418, 50530), (589, 35860), (620, 34067), (652, 32395), (682, 30970), (815, 25916), (836, 25265), (1045, 20212), (1178, 17930), (1364, 15485), (1630, 12958), (1705, 12388), (1793, 11780), (2090, 10106), (2356, 8965), (2945, 7172), (3097, 6820), (3260, 6479), (3410, 6194), (3586, 5890), (4180, 5053)]