21012180

素因数分解:

$2^2\times 3^1\times 5^1\times 7^3\times {\mathrm{1021}}^1$

素因数の和:1054

約数の個数: 96

約数和(自身を含む): 68678400

約数和(自身を除く): 47666220

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 49, 60, 70, 84, 98, 105, 140, 147, 196, 210, 245, 294, 343, 420, 490, 588, 686, 735, 980, 1021, 1029, 1372, 1470, 1715, 2042, 2058, 2940, 3063, 3430, 4084, 4116, 5105, 5145, 6126, 6860, 7147, 10210, 10290, 12252, 14294, 15315, 20420, 20580, 21441, 28588, 30630, 35735, 42882, 50029, 61260, 71470, 85764, 100058, 107205, 142940, 150087, 200116, 214410, 250145, 300174, 350203, 428820, 500290, 600348, 700406, 750435, 1000580, 1050609, 1400812, 1500870, 1751015, 2101218, 3001740, 3502030, 4202436, 5253045, 7004060, 10506090, 21012180]

約数ペア:

[(1, 21012180), (2, 10506090), (3, 7004060), (4, 5253045), (5, 4202436), (6, 3502030), (7, 3001740), (10, 2101218), (12, 1751015), (14, 1500870), (15, 1400812), (20, 1050609), (21, 1000580), (28, 750435), (30, 700406), (35, 600348), (42, 500290), (49, 428820), (60, 350203), (70, 300174), (84, 250145), (98, 214410), (105, 200116), (140, 150087), (147, 142940), (196, 107205), (210, 100058), (245, 85764), (294, 71470), (343, 61260), (420, 50029), (490, 42882), (588, 35735), (686, 30630), (735, 28588), (980, 21441), (1021, 20580), (1029, 20420), (1372, 15315), (1470, 14294), (1715, 12252), (2042, 10290), (2058, 10210), (2940, 7147), (3063, 6860), (3430, 6126), (4084, 5145), (4116, 5105)]