19901680

素因数分解:

$2^4\times 5^1\times {\mathrm{47}}^1\times {\mathrm{67}}^1\times {\mathrm{79}}^1$

素因数の和:206

約数の個数: 80

約数和(自身を含む): 48568320

約数和(自身を除く): 28666640

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 47, 67, 79, 80, 94, 134, 158, 188, 235, 268, 316, 335, 376, 395, 470, 536, 632, 670, 752, 790, 940, 1072, 1264, 1340, 1580, 1880, 2680, 3149, 3160, 3713, 3760, 5293, 5360, 6298, 6320, 7426, 10586, 12596, 14852, 15745, 18565, 21172, 25192, 26465, 29704, 31490, 37130, 42344, 50384, 52930, 59408, 62980, 74260, 84688, 105860, 125960, 148520, 211720, 248771, 251920, 297040, 423440, 497542, 995084, 1243855, 1990168, 2487710, 3980336, 4975420, 9950840, 19901680]

約数ペア:

[(1, 19901680), (2, 9950840), (4, 4975420), (5, 3980336), (8, 2487710), (10, 1990168), (16, 1243855), (20, 995084), (40, 497542), (47, 423440), (67, 297040), (79, 251920), (80, 248771), (94, 211720), (134, 148520), (158, 125960), (188, 105860), (235, 84688), (268, 74260), (316, 62980), (335, 59408), (376, 52930), (395, 50384), (470, 42344), (536, 37130), (632, 31490), (670, 29704), (752, 26465), (790, 25192), (940, 21172), (1072, 18565), (1264, 15745), (1340, 14852), (1580, 12596), (1880, 10586), (2680, 7426), (3149, 6320), (3160, 6298), (3713, 5360), (3760, 5293)]