21204820

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{191}}^1$

素因数の和:281

約数の個数: 96

約数和(自身を含む): 55996416

約数和(自身を除く): 34791596

約数列:

[1, 2, 4, 5, 7, 10, 13, 14, 20, 26, 28, 35, 52, 61, 65, 70, 91, 122, 130, 140, 182, 191, 244, 260, 305, 364, 382, 427, 455, 610, 764, 793, 854, 910, 955, 1220, 1337, 1586, 1708, 1820, 1910, 2135, 2483, 2674, 3172, 3820, 3965, 4270, 4966, 5348, 5551, 6685, 7930, 8540, 9932, 11102, 11651, 12415, 13370, 15860, 17381, 22204, 23302, 24830, 26740, 27755, 34762, 46604, 49660, 55510, 58255, 69524, 81557, 86905, 111020, 116510, 151463, 163114, 173810, 233020, 302926, 326228, 347620, 407785, 605852, 757315, 815570, 1060241, 1514630, 1631140, 2120482, 3029260, 4240964, 5301205, 10602410, 21204820]

約数ペア:

[(1, 21204820), (2, 10602410), (4, 5301205), (5, 4240964), (7, 3029260), (10, 2120482), (13, 1631140), (14, 1514630), (20, 1060241), (26, 815570), (28, 757315), (35, 605852), (52, 407785), (61, 347620), (65, 326228), (70, 302926), (91, 233020), (122, 173810), (130, 163114), (140, 151463), (182, 116510), (191, 111020), (244, 86905), (260, 81557), (305, 69524), (364, 58255), (382, 55510), (427, 49660), (455, 46604), (610, 34762), (764, 27755), (793, 26740), (854, 24830), (910, 23302), (955, 22204), (1220, 17381), (1337, 15860), (1586, 13370), (1708, 12415), (1820, 11651), (1910, 11102), (2135, 9932), (2483, 8540), (2674, 7930), (3172, 6685), (3820, 5551), (3965, 5348), (4270, 4966)]