21784660

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{73}}^1\times {\mathrm{347}}^1$

素因数の和:472

約数の個数: 48

約数和(自身を含む): 47589696

約数和(自身を除く): 25805036

約数列:

[1, 2, 4, 5, 10, 20, 43, 73, 86, 146, 172, 215, 292, 347, 365, 430, 694, 730, 860, 1388, 1460, 1735, 3139, 3470, 6278, 6940, 12556, 14921, 15695, 25331, 29842, 31390, 50662, 59684, 62780, 74605, 101324, 126655, 149210, 253310, 298420, 506620, 1089233, 2178466, 4356932, 5446165, 10892330, 21784660]

約数ペア:

[(1, 21784660), (2, 10892330), (4, 5446165), (5, 4356932), (10, 2178466), (20, 1089233), (43, 506620), (73, 298420), (86, 253310), (146, 149210), (172, 126655), (215, 101324), (292, 74605), (347, 62780), (365, 59684), (430, 50662), (694, 31390), (730, 29842), (860, 25331), (1388, 15695), (1460, 14921), (1735, 12556), (3139, 6940), (3470, 6278)]