21370840

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{83}}^1\times {\mathrm{157}}^1$

素因数の和:292

約数の個数: 64

約数和(自身を含む): 50168160

約数和(自身を除く): 28797320

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 83, 157, 164, 166, 205, 314, 328, 332, 410, 415, 628, 664, 785, 820, 830, 1256, 1570, 1640, 1660, 3140, 3320, 3403, 6280, 6437, 6806, 12874, 13031, 13612, 17015, 25748, 26062, 27224, 32185, 34030, 51496, 52124, 64370, 65155, 68060, 104248, 128740, 130310, 136120, 257480, 260620, 521240, 534271, 1068542, 2137084, 2671355, 4274168, 5342710, 10685420, 21370840]

約数ペア:

[(1, 21370840), (2, 10685420), (4, 5342710), (5, 4274168), (8, 2671355), (10, 2137084), (20, 1068542), (40, 534271), (41, 521240), (82, 260620), (83, 257480), (157, 136120), (164, 130310), (166, 128740), (205, 104248), (314, 68060), (328, 65155), (332, 64370), (410, 52124), (415, 51496), (628, 34030), (664, 32185), (785, 27224), (820, 26062), (830, 25748), (1256, 17015), (1570, 13612), (1640, 13031), (1660, 12874), (3140, 6806), (3320, 6437), (3403, 6280)]