18183980

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{139}}^1\times {\mathrm{211}}^1$

素因数の和:390

約数の個数: 48

約数和(自身を含む): 39889920

約数和(自身を除く): 21705940

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 124, 139, 155, 211, 278, 310, 422, 556, 620, 695, 844, 1055, 1390, 2110, 2780, 4220, 4309, 6541, 8618, 13082, 17236, 21545, 26164, 29329, 32705, 43090, 58658, 65410, 86180, 117316, 130820, 146645, 293290, 586580, 909199, 1818398, 3636796, 4545995, 9091990, 18183980]

約数ペア:

[(1, 18183980), (2, 9091990), (4, 4545995), (5, 3636796), (10, 1818398), (20, 909199), (31, 586580), (62, 293290), (124, 146645), (139, 130820), (155, 117316), (211, 86180), (278, 65410), (310, 58658), (422, 43090), (556, 32705), (620, 29329), (695, 26164), (844, 21545), (1055, 17236), (1390, 13082), (2110, 8618), (2780, 6541), (4220, 4309)]