19907960

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{61}}^1\times {\mathrm{199}}^1$

素因数の和:312

約数の個数: 64

約数和(自身を含む): 46872000

約数和(自身を除く): 26964040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 61, 82, 122, 164, 199, 205, 244, 305, 328, 398, 410, 488, 610, 796, 820, 995, 1220, 1592, 1640, 1990, 2440, 2501, 3980, 5002, 7960, 8159, 10004, 12139, 12505, 16318, 20008, 24278, 25010, 32636, 40795, 48556, 50020, 60695, 65272, 81590, 97112, 100040, 121390, 163180, 242780, 326360, 485560, 497699, 995398, 1990796, 2488495, 3981592, 4976990, 9953980, 19907960]

約数ペア:

[(1, 19907960), (2, 9953980), (4, 4976990), (5, 3981592), (8, 2488495), (10, 1990796), (20, 995398), (40, 497699), (41, 485560), (61, 326360), (82, 242780), (122, 163180), (164, 121390), (199, 100040), (205, 97112), (244, 81590), (305, 65272), (328, 60695), (398, 50020), (410, 48556), (488, 40795), (610, 32636), (796, 25010), (820, 24278), (995, 20008), (1220, 16318), (1592, 12505), (1640, 12139), (1990, 10004), (2440, 8159), (2501, 7960), (3980, 5002)]