21685030

素因数分解:

$2^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{199}}^1\times {\mathrm{641}}^1$

素因数の和:864

約数の個数: 32

約数和(自身を含む): 41601600

約数和(自身を除く): 19916570

約数列:

[1, 2, 5, 10, 17, 34, 85, 170, 199, 398, 641, 995, 1282, 1990, 3205, 3383, 6410, 6766, 10897, 16915, 21794, 33830, 54485, 108970, 127559, 255118, 637795, 1275590, 2168503, 4337006, 10842515, 21685030]

約数ペア:

[(1, 21685030), (2, 10842515), (5, 4337006), (10, 2168503), (17, 1275590), (34, 637795), (85, 255118), (170, 127559), (199, 108970), (398, 54485), (641, 33830), (995, 21794), (1282, 16915), (1990, 10897), (3205, 6766), (3383, 6410)]