21049420

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{47}}^1\times {\mathrm{457}}^1$

素因数の和:527

約数の個数: 72

約数和(自身を含む): 52629696

約数和(自身を除く): 31580276

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 47, 49, 70, 94, 98, 140, 188, 196, 235, 245, 329, 457, 470, 490, 658, 914, 940, 980, 1316, 1645, 1828, 2285, 2303, 3199, 3290, 4570, 4606, 6398, 6580, 9140, 9212, 11515, 12796, 15995, 21479, 22393, 23030, 31990, 42958, 44786, 46060, 63980, 85916, 89572, 107395, 111965, 150353, 214790, 223930, 300706, 429580, 447860, 601412, 751765, 1052471, 1503530, 2104942, 3007060, 4209884, 5262355, 10524710, 21049420]

約数ペア:

[(1, 21049420), (2, 10524710), (4, 5262355), (5, 4209884), (7, 3007060), (10, 2104942), (14, 1503530), (20, 1052471), (28, 751765), (35, 601412), (47, 447860), (49, 429580), (70, 300706), (94, 223930), (98, 214790), (140, 150353), (188, 111965), (196, 107395), (235, 89572), (245, 85916), (329, 63980), (457, 46060), (470, 44786), (490, 42958), (658, 31990), (914, 23030), (940, 22393), (980, 21479), (1316, 15995), (1645, 12796), (1828, 11515), (2285, 9212), (2303, 9140), (3199, 6580), (3290, 6398), (4570, 4606)]