21017640

素因数分解:

$2^3\times 3^1\times 5^1\times 7^1\times {\mathrm{131}}^1\times {\mathrm{191}}^1$

素因数の和:343

約数の個数: 128

約数和(自身を含む): 72990720

約数和(自身を除く): 51973080

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 56, 60, 70, 84, 105, 120, 131, 140, 168, 191, 210, 262, 280, 382, 393, 420, 524, 573, 655, 764, 786, 840, 917, 955, 1048, 1146, 1310, 1337, 1528, 1572, 1834, 1910, 1965, 2292, 2620, 2674, 2751, 2865, 3144, 3668, 3820, 3930, 4011, 4584, 4585, 5240, 5348, 5502, 5730, 6685, 7336, 7640, 7860, 8022, 9170, 10696, 11004, 11460, 13370, 13755, 15720, 16044, 18340, 20055, 22008, 22920, 25021, 26740, 27510, 32088, 36680, 40110, 50042, 53480, 55020, 75063, 80220, 100084, 110040, 125105, 150126, 160440, 175147, 200168, 250210, 300252, 350294, 375315, 500420, 525441, 600504, 700588, 750630, 875735, 1000840, 1050882, 1401176, 1501260, 1751470, 2101764, 2627205, 3002520, 3502940, 4203528, 5254410, 7005880, 10508820, 21017640]

約数ペア:

[(1, 21017640), (2, 10508820), (3, 7005880), (4, 5254410), (5, 4203528), (6, 3502940), (7, 3002520), (8, 2627205), (10, 2101764), (12, 1751470), (14, 1501260), (15, 1401176), (20, 1050882), (21, 1000840), (24, 875735), (28, 750630), (30, 700588), (35, 600504), (40, 525441), (42, 500420), (56, 375315), (60, 350294), (70, 300252), (84, 250210), (105, 200168), (120, 175147), (131, 160440), (140, 150126), (168, 125105), (191, 110040), (210, 100084), (262, 80220), (280, 75063), (382, 55020), (393, 53480), (420, 50042), (524, 40110), (573, 36680), (655, 32088), (764, 27510), (786, 26740), (840, 25021), (917, 22920), (955, 22008), (1048, 20055), (1146, 18340), (1310, 16044), (1337, 15720), (1528, 13755), (1572, 13370), (1834, 11460), (1910, 11004), (1965, 10696), (2292, 9170), (2620, 8022), (2674, 7860), (2751, 7640), (2865, 7336), (3144, 6685), (3668, 5730), (3820, 5502), (3930, 5348), (4011, 5240), (4584, 4585)]