640456620

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{23}}^1\times {\mathrm{43}}^2\times {\mathrm{251}}^1$

素因数の和:372

約数の個数: 144

約数和(自身を含む): 1923409152

約数和(自身を除く): 1282952532

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 23, 30, 43, 46, 60, 69, 86, 92, 115, 129, 138, 172, 215, 230, 251, 258, 276, 345, 430, 460, 502, 516, 645, 690, 753, 860, 989, 1004, 1255, 1290, 1380, 1506, 1849, 1978, 2510, 2580, 2967, 3012, 3698, 3765, 3956, 4945, 5020, 5547, 5773, 5934, 7396, 7530, 9245, 9890, 10793, 11094, 11546, 11868, 14835, 15060, 17319, 18490, 19780, 21586, 22188, 23092, 27735, 28865, 29670, 32379, 34638, 36980, 42527, 43172, 53965, 55470, 57730, 59340, 64758, 69276, 85054, 86595, 107930, 110940, 115460, 127581, 129516, 161895, 170108, 173190, 212635, 215860, 248239, 255162, 323790, 346380, 425270, 464099, 496478, 510324, 637905, 647580, 744717, 850540, 928198, 992956, 1241195, 1275810, 1392297, 1489434, 1856396, 2320495, 2482390, 2551620, 2784594, 2978868, 3723585, 4640990, 4964780, 5569188, 6961485, 7447170, 9281980, 10674277, 13922970, 14894340, 21348554, 27845940, 32022831, 42697108, 53371385, 64045662, 106742770, 128091324, 160114155, 213485540, 320228310, 640456620]

約数ペア:

[(1, 640456620), (2, 320228310), (3, 213485540), (4, 160114155), (5, 128091324), (6, 106742770), (10, 64045662), (12, 53371385), (15, 42697108), (20, 32022831), (23, 27845940), (30, 21348554), (43, 14894340), (46, 13922970), (60, 10674277), (69, 9281980), (86, 7447170), (92, 6961485), (115, 5569188), (129, 4964780), (138, 4640990), (172, 3723585), (215, 2978868), (230, 2784594), (251, 2551620), (258, 2482390), (276, 2320495), (345, 1856396), (430, 1489434), (460, 1392297), (502, 1275810), (516, 1241195), (645, 992956), (690, 928198), (753, 850540), (860, 744717), (989, 647580), (1004, 637905), (1255, 510324), (1290, 496478), (1380, 464099), (1506, 425270), (1849, 346380), (1978, 323790), (2510, 255162), (2580, 248239), (2967, 215860), (3012, 212635), (3698, 173190), (3765, 170108), (3956, 161895), (4945, 129516), (5020, 127581), (5547, 115460), (5773, 110940), (5934, 107930), (7396, 86595), (7530, 85054), (9245, 69276), (9890, 64758), (10793, 59340), (11094, 57730), (11546, 55470), (11868, 53965), (14835, 43172), (15060, 42527), (17319, 36980), (18490, 34638), (19780, 32379), (21586, 29670), (22188, 28865), (23092, 27735)]