21271240

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{83}}^1\times {\mathrm{149}}^1$

素因数の和:286

約数の個数: 64

約数和(自身を含む): 49896000

約数和(自身を除く): 28624760

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 83, 86, 149, 166, 172, 215, 298, 332, 344, 415, 430, 596, 664, 745, 830, 860, 1192, 1490, 1660, 1720, 2980, 3320, 3569, 5960, 6407, 7138, 12367, 12814, 14276, 17845, 24734, 25628, 28552, 32035, 35690, 49468, 51256, 61835, 64070, 71380, 98936, 123670, 128140, 142760, 247340, 256280, 494680, 531781, 1063562, 2127124, 2658905, 4254248, 5317810, 10635620, 21271240]

約数ペア:

[(1, 21271240), (2, 10635620), (4, 5317810), (5, 4254248), (8, 2658905), (10, 2127124), (20, 1063562), (40, 531781), (43, 494680), (83, 256280), (86, 247340), (149, 142760), (166, 128140), (172, 123670), (215, 98936), (298, 71380), (332, 64070), (344, 61835), (415, 51256), (430, 49468), (596, 35690), (664, 32035), (745, 28552), (830, 25628), (860, 24734), (1192, 17845), (1490, 14276), (1660, 12814), (1720, 12367), (2980, 7138), (3320, 6407), (3569, 5960)]