21040040

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{163}}^1\times {\mathrm{461}}^1$

素因数の和:642

約数の個数: 64

約数和(自身を含む): 54552960

約数和(自身を除く): 33512920

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 163, 280, 326, 461, 652, 815, 922, 1141, 1304, 1630, 1844, 2282, 2305, 3227, 3260, 3688, 4564, 4610, 5705, 6454, 6520, 9128, 9220, 11410, 12908, 16135, 18440, 22820, 25816, 32270, 45640, 64540, 75143, 129080, 150286, 300572, 375715, 526001, 601144, 751430, 1052002, 1502860, 2104004, 2630005, 3005720, 4208008, 5260010, 10520020, 21040040]

約数ペア:

[(1, 21040040), (2, 10520020), (4, 5260010), (5, 4208008), (7, 3005720), (8, 2630005), (10, 2104004), (14, 1502860), (20, 1052002), (28, 751430), (35, 601144), (40, 526001), (56, 375715), (70, 300572), (140, 150286), (163, 129080), (280, 75143), (326, 64540), (461, 45640), (652, 32270), (815, 25816), (922, 22820), (1141, 18440), (1304, 16135), (1630, 12908), (1844, 11410), (2282, 9220), (2305, 9128), (3227, 6520), (3260, 6454), (3688, 5705), (4564, 4610)]