20640320

素因数分解:

$2^6\times 5^1\times {\mathrm{53}}^1\times {\mathrm{1217}}^1$

素因数の和:1287

約数の個数: 56

約数和(自身を含む): 50118264

約数和(自身を除く): 29477944

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 53, 64, 80, 106, 160, 212, 265, 320, 424, 530, 848, 1060, 1217, 1696, 2120, 2434, 3392, 4240, 4868, 6085, 8480, 9736, 12170, 16960, 19472, 24340, 38944, 48680, 64501, 77888, 97360, 129002, 194720, 258004, 322505, 389440, 516008, 645010, 1032016, 1290020, 2064032, 2580040, 4128064, 5160080, 10320160, 20640320]

約数ペア:

[(1, 20640320), (2, 10320160), (4, 5160080), (5, 4128064), (8, 2580040), (10, 2064032), (16, 1290020), (20, 1032016), (32, 645010), (40, 516008), (53, 389440), (64, 322505), (80, 258004), (106, 194720), (160, 129002), (212, 97360), (265, 77888), (320, 64501), (424, 48680), (530, 38944), (848, 24340), (1060, 19472), (1217, 16960), (1696, 12170), (2120, 9736), (2434, 8480), (3392, 6085), (4240, 4868)]