20668720

素因数分解:

$2^4\times 5^1\times {\mathrm{23}}^1\times {\mathrm{47}}^1\times {\mathrm{239}}^1$

素因数の和:322

約数の個数: 80

約数和(自身を含む): 51425280

約数和(自身を除く): 30756560

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 23, 40, 46, 47, 80, 92, 94, 115, 184, 188, 230, 235, 239, 368, 376, 460, 470, 478, 752, 920, 940, 956, 1081, 1195, 1840, 1880, 1912, 2162, 2390, 3760, 3824, 4324, 4780, 5405, 5497, 8648, 9560, 10810, 10994, 11233, 17296, 19120, 21620, 21988, 22466, 27485, 43240, 43976, 44932, 54970, 56165, 86480, 87952, 89864, 109940, 112330, 179728, 219880, 224660, 258359, 439760, 449320, 516718, 898640, 1033436, 1291795, 2066872, 2583590, 4133744, 5167180, 10334360, 20668720]

約数ペア:

[(1, 20668720), (2, 10334360), (4, 5167180), (5, 4133744), (8, 2583590), (10, 2066872), (16, 1291795), (20, 1033436), (23, 898640), (40, 516718), (46, 449320), (47, 439760), (80, 258359), (92, 224660), (94, 219880), (115, 179728), (184, 112330), (188, 109940), (230, 89864), (235, 87952), (239, 86480), (368, 56165), (376, 54970), (460, 44932), (470, 43976), (478, 43240), (752, 27485), (920, 22466), (940, 21988), (956, 21620), (1081, 19120), (1195, 17296), (1840, 11233), (1880, 10994), (1912, 10810), (2162, 9560), (2390, 8648), (3760, 5497), (3824, 5405), (4324, 4780)]