20851780

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{59}}^1\times {\mathrm{431}}^1$

素因数の和:540

約数の個数: 48

約数和(自身を含む): 45722880

約数和(自身を除く): 24871100

約数列:

[1, 2, 4, 5, 10, 20, 41, 59, 82, 118, 164, 205, 236, 295, 410, 431, 590, 820, 862, 1180, 1724, 2155, 2419, 4310, 4838, 8620, 9676, 12095, 17671, 24190, 25429, 35342, 48380, 50858, 70684, 88355, 101716, 127145, 176710, 254290, 353420, 508580, 1042589, 2085178, 4170356, 5212945, 10425890, 20851780]

約数ペア:

[(1, 20851780), (2, 10425890), (4, 5212945), (5, 4170356), (10, 2085178), (20, 1042589), (41, 508580), (59, 353420), (82, 254290), (118, 176710), (164, 127145), (205, 101716), (236, 88355), (295, 70684), (410, 50858), (431, 48380), (590, 35342), (820, 25429), (862, 24190), (1180, 17671), (1724, 12095), (2155, 9676), (2419, 8620), (4310, 4838)]