21342880

素因数分解:

$2^5\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{331}}^1$

素因数の和:390

約数の個数: 96

約数和(自身を含む): 56222208

約数和(自身を除く): 34879328

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 31, 32, 40, 52, 62, 65, 80, 104, 124, 130, 155, 160, 208, 248, 260, 310, 331, 403, 416, 496, 520, 620, 662, 806, 992, 1040, 1240, 1324, 1612, 1655, 2015, 2080, 2480, 2648, 3224, 3310, 4030, 4303, 4960, 5296, 6448, 6620, 8060, 8606, 10261, 10592, 12896, 13240, 16120, 17212, 20522, 21515, 26480, 32240, 34424, 41044, 43030, 51305, 52960, 64480, 68848, 82088, 86060, 102610, 133393, 137696, 164176, 172120, 205220, 266786, 328352, 344240, 410440, 533572, 666965, 688480, 820880, 1067144, 1333930, 1641760, 2134288, 2667860, 4268576, 5335720, 10671440, 21342880]

約数ペア:

[(1, 21342880), (2, 10671440), (4, 5335720), (5, 4268576), (8, 2667860), (10, 2134288), (13, 1641760), (16, 1333930), (20, 1067144), (26, 820880), (31, 688480), (32, 666965), (40, 533572), (52, 410440), (62, 344240), (65, 328352), (80, 266786), (104, 205220), (124, 172120), (130, 164176), (155, 137696), (160, 133393), (208, 102610), (248, 86060), (260, 82088), (310, 68848), (331, 64480), (403, 52960), (416, 51305), (496, 43030), (520, 41044), (620, 34424), (662, 32240), (806, 26480), (992, 21515), (1040, 20522), (1240, 17212), (1324, 16120), (1612, 13240), (1655, 12896), (2015, 10592), (2080, 10261), (2480, 8606), (2648, 8060), (3224, 6620), (3310, 6448), (4030, 5296), (4303, 4960)]