21639380

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{71}}^1\times {\mathrm{311}}^1$

素因数の和:405

約数の個数: 72

約数和(自身を含む): 53778816

約数和(自身を除く): 32139436

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 71, 98, 140, 142, 196, 245, 284, 311, 355, 490, 497, 622, 710, 980, 994, 1244, 1420, 1555, 1988, 2177, 2485, 3110, 3479, 4354, 4970, 6220, 6958, 8708, 9940, 10885, 13916, 15239, 17395, 21770, 22081, 30478, 34790, 43540, 44162, 60956, 69580, 76195, 88324, 110405, 152390, 154567, 220810, 304780, 309134, 441620, 618268, 772835, 1081969, 1545670, 2163938, 3091340, 4327876, 5409845, 10819690, 21639380]

約数ペア:

[(1, 21639380), (2, 10819690), (4, 5409845), (5, 4327876), (7, 3091340), (10, 2163938), (14, 1545670), (20, 1081969), (28, 772835), (35, 618268), (49, 441620), (70, 309134), (71, 304780), (98, 220810), (140, 154567), (142, 152390), (196, 110405), (245, 88324), (284, 76195), (311, 69580), (355, 60956), (490, 44162), (497, 43540), (622, 34790), (710, 30478), (980, 22081), (994, 21770), (1244, 17395), (1420, 15239), (1555, 13916), (1988, 10885), (2177, 9940), (2485, 8708), (3110, 6958), (3479, 6220), (4354, 4970)]