21143960

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{647}}^1$

素因数の和:720

約数の個数: 64

約数和(自身を含む): 51321600

約数和(自身を除く): 30177640

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 43, 76, 86, 95, 152, 172, 190, 215, 344, 380, 430, 647, 760, 817, 860, 1294, 1634, 1720, 2588, 3235, 3268, 4085, 5176, 6470, 6536, 8170, 12293, 12940, 16340, 24586, 25880, 27821, 32680, 49172, 55642, 61465, 98344, 111284, 122930, 139105, 222568, 245860, 278210, 491720, 528599, 556420, 1057198, 1112840, 2114396, 2642995, 4228792, 5285990, 10571980, 21143960]

約数ペア:

[(1, 21143960), (2, 10571980), (4, 5285990), (5, 4228792), (8, 2642995), (10, 2114396), (19, 1112840), (20, 1057198), (38, 556420), (40, 528599), (43, 491720), (76, 278210), (86, 245860), (95, 222568), (152, 139105), (172, 122930), (190, 111284), (215, 98344), (344, 61465), (380, 55642), (430, 49172), (647, 32680), (760, 27821), (817, 25880), (860, 24586), (1294, 16340), (1634, 12940), (1720, 12293), (2588, 8170), (3235, 6536), (3268, 6470), (4085, 5176)]