21720400

素因数分解:

$2^4\times 5^2\times {\mathrm{13}}^1\times {\mathrm{4177}}^1$

素因数の和:4208

約数の個数: 60

約数和(自身を含む): 56210812

約数和(自身を除く): 34490412

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 25, 26, 40, 50, 52, 65, 80, 100, 104, 130, 200, 208, 260, 325, 400, 520, 650, 1040, 1300, 2600, 4177, 5200, 8354, 16708, 20885, 33416, 41770, 54301, 66832, 83540, 104425, 108602, 167080, 208850, 217204, 271505, 334160, 417700, 434408, 543010, 835400, 868816, 1086020, 1357525, 1670800, 2172040, 2715050, 4344080, 5430100, 10860200, 21720400]

約数ペア:

[(1, 21720400), (2, 10860200), (4, 5430100), (5, 4344080), (8, 2715050), (10, 2172040), (13, 1670800), (16, 1357525), (20, 1086020), (25, 868816), (26, 835400), (40, 543010), (50, 434408), (52, 417700), (65, 334160), (80, 271505), (100, 217204), (104, 208850), (130, 167080), (200, 108602), (208, 104425), (260, 83540), (325, 66832), (400, 54301), (520, 41770), (650, 33416), (1040, 20885), (1300, 16708), (2600, 8354), (4177, 5200)]