21283880

素因数分解:

$2^3\times 5^1\times {\mathrm{37}}^1\times {\mathrm{73}}^1\times {\mathrm{197}}^1$

素因数の和:318

約数の個数: 64

約数和(自身を含む): 50109840

約数和(自身を除く): 28825960

約数列:

[1, 2, 4, 5, 8, 10, 20, 37, 40, 73, 74, 146, 148, 185, 197, 292, 296, 365, 370, 394, 584, 730, 740, 788, 985, 1460, 1480, 1576, 1970, 2701, 2920, 3940, 5402, 7289, 7880, 10804, 13505, 14381, 14578, 21608, 27010, 28762, 29156, 36445, 54020, 57524, 58312, 71905, 72890, 108040, 115048, 143810, 145780, 287620, 291560, 532097, 575240, 1064194, 2128388, 2660485, 4256776, 5320970, 10641940, 21283880]

約数ペア:

[(1, 21283880), (2, 10641940), (4, 5320970), (5, 4256776), (8, 2660485), (10, 2128388), (20, 1064194), (37, 575240), (40, 532097), (73, 291560), (74, 287620), (146, 145780), (148, 143810), (185, 115048), (197, 108040), (292, 72890), (296, 71905), (365, 58312), (370, 57524), (394, 54020), (584, 36445), (730, 29156), (740, 28762), (788, 27010), (985, 21608), (1460, 14578), (1480, 14381), (1576, 13505), (1970, 10804), (2701, 7880), (2920, 7289), (3940, 5402)]