21118880

素因数分解:

$2^5\times 5^1\times {\mathrm{19}}^1\times {\mathrm{6947}}^1$

素因数の和:6981

約数の個数: 48

約数和(自身を含む): 52526880

約数和(自身を除く): 31408000

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 32, 38, 40, 76, 80, 95, 152, 160, 190, 304, 380, 608, 760, 1520, 3040, 6947, 13894, 27788, 34735, 55576, 69470, 111152, 131993, 138940, 222304, 263986, 277880, 527972, 555760, 659965, 1055944, 1111520, 1319930, 2111888, 2639860, 4223776, 5279720, 10559440, 21118880]

約数ペア:

[(1, 21118880), (2, 10559440), (4, 5279720), (5, 4223776), (8, 2639860), (10, 2111888), (16, 1319930), (19, 1111520), (20, 1055944), (32, 659965), (38, 555760), (40, 527972), (76, 277880), (80, 263986), (95, 222304), (152, 138940), (160, 131993), (190, 111152), (304, 69470), (380, 55576), (608, 34735), (760, 27788), (1520, 13894), (3040, 6947)]