20515760

素因数分解:

$2^4\times 5^1\times {\mathrm{29}}^1\times {\mathrm{37}}^1\times {\mathrm{239}}^1$

素因数の和:318

約数の個数: 80

約数和(自身を含む): 50889600

約数和(自身を除く): 30373840

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 29, 37, 40, 58, 74, 80, 116, 145, 148, 185, 232, 239, 290, 296, 370, 464, 478, 580, 592, 740, 956, 1073, 1160, 1195, 1480, 1912, 2146, 2320, 2390, 2960, 3824, 4292, 4780, 5365, 6931, 8584, 8843, 9560, 10730, 13862, 17168, 17686, 19120, 21460, 27724, 34655, 35372, 42920, 44215, 55448, 69310, 70744, 85840, 88430, 110896, 138620, 141488, 176860, 256447, 277240, 353720, 512894, 554480, 707440, 1025788, 1282235, 2051576, 2564470, 4103152, 5128940, 10257880, 20515760]

約数ペア:

[(1, 20515760), (2, 10257880), (4, 5128940), (5, 4103152), (8, 2564470), (10, 2051576), (16, 1282235), (20, 1025788), (29, 707440), (37, 554480), (40, 512894), (58, 353720), (74, 277240), (80, 256447), (116, 176860), (145, 141488), (148, 138620), (185, 110896), (232, 88430), (239, 85840), (290, 70744), (296, 69310), (370, 55448), (464, 44215), (478, 42920), (580, 35372), (592, 34655), (740, 27724), (956, 21460), (1073, 19120), (1160, 17686), (1195, 17168), (1480, 13862), (1912, 10730), (2146, 9560), (2320, 8843), (2390, 8584), (2960, 6931), (3824, 5365), (4292, 4780)]