320022520

素因数分解:

$2^3\times 5^1\times {\mathrm{131}}^1\times {\mathrm{157}}^1\times {\mathrm{389}}^1$

素因数の和:688

約数の個数: 64

約数和(自身を含む): 732045600

約数和(自身を除く): 412023080

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 131, 157, 262, 314, 389, 524, 628, 655, 778, 785, 1048, 1256, 1310, 1556, 1570, 1945, 2620, 3112, 3140, 3890, 5240, 6280, 7780, 15560, 20567, 41134, 50959, 61073, 82268, 101918, 102835, 122146, 164536, 203836, 205670, 244292, 254795, 305365, 407672, 411340, 488584, 509590, 610730, 822680, 1019180, 1221460, 2038360, 2442920, 8000563, 16001126, 32002252, 40002815, 64004504, 80005630, 160011260, 320022520]

約数ペア:

[(1, 320022520), (2, 160011260), (4, 80005630), (5, 64004504), (8, 40002815), (10, 32002252), (20, 16001126), (40, 8000563), (131, 2442920), (157, 2038360), (262, 1221460), (314, 1019180), (389, 822680), (524, 610730), (628, 509590), (655, 488584), (778, 411340), (785, 407672), (1048, 305365), (1256, 254795), (1310, 244292), (1556, 205670), (1570, 203836), (1945, 164536), (2620, 122146), (3112, 102835), (3140, 101918), (3890, 82268), (5240, 61073), (6280, 50959), (7780, 41134), (15560, 20567)]