21568820

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{1693}}^1$

素因数の和:1729

約数の個数: 72

約数和(自身を含む): 56776104

約数和(自身を除く): 35207284

約数列:

[1, 2, 4, 5, 7, 10, 13, 14, 20, 26, 28, 35, 49, 52, 65, 70, 91, 98, 130, 140, 182, 196, 245, 260, 364, 455, 490, 637, 910, 980, 1274, 1693, 1820, 2548, 3185, 3386, 6370, 6772, 8465, 11851, 12740, 16930, 22009, 23702, 33860, 44018, 47404, 59255, 82957, 88036, 110045, 118510, 154063, 165914, 220090, 237020, 308126, 331828, 414785, 440180, 616252, 770315, 829570, 1078441, 1540630, 1659140, 2156882, 3081260, 4313764, 5392205, 10784410, 21568820]

約数ペア:

[(1, 21568820), (2, 10784410), (4, 5392205), (5, 4313764), (7, 3081260), (10, 2156882), (13, 1659140), (14, 1540630), (20, 1078441), (26, 829570), (28, 770315), (35, 616252), (49, 440180), (52, 414785), (65, 331828), (70, 308126), (91, 237020), (98, 220090), (130, 165914), (140, 154063), (182, 118510), (196, 110045), (245, 88036), (260, 82957), (364, 59255), (455, 47404), (490, 44018), (637, 33860), (910, 23702), (980, 22009), (1274, 16930), (1693, 12740), (1820, 11851), (2548, 8465), (3185, 6772), (3386, 6370)]