21728805

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{17}}^1\times {\mathrm{37}}^1\times {\mathrm{47}}^1$

素因数の和:123

約数の個数: 96

約数和(自身を含む): 44914176

約数和(自身を除く): 23185371

約数列:

[1, 3, 5, 7, 15, 17, 21, 35, 37, 47, 49, 51, 85, 105, 111, 119, 141, 147, 185, 235, 245, 255, 259, 329, 357, 555, 595, 629, 705, 735, 777, 799, 833, 987, 1295, 1645, 1739, 1785, 1813, 1887, 2303, 2397, 2499, 3145, 3885, 3995, 4165, 4403, 4935, 5217, 5439, 5593, 6909, 8695, 9065, 9435, 11515, 11985, 12173, 12495, 13209, 16779, 22015, 26085, 27195, 27965, 29563, 30821, 34545, 36519, 39151, 60865, 66045, 83895, 85211, 88689, 92463, 117453, 147815, 154105, 182595, 195755, 206941, 255633, 426055, 443445, 462315, 587265, 620823, 1034705, 1278165, 1448587, 3104115, 4345761, 7242935, 21728805]

約数ペア:

[(1, 21728805), (3, 7242935), (5, 4345761), (7, 3104115), (15, 1448587), (17, 1278165), (21, 1034705), (35, 620823), (37, 587265), (47, 462315), (49, 443445), (51, 426055), (85, 255633), (105, 206941), (111, 195755), (119, 182595), (141, 154105), (147, 147815), (185, 117453), (235, 92463), (245, 88689), (255, 85211), (259, 83895), (329, 66045), (357, 60865), (555, 39151), (595, 36519), (629, 34545), (705, 30821), (735, 29563), (777, 27965), (799, 27195), (833, 26085), (987, 22015), (1295, 16779), (1645, 13209), (1739, 12495), (1785, 12173), (1813, 11985), (1887, 11515), (2303, 9435), (2397, 9065), (2499, 8695), (3145, 6909), (3885, 5593), (3995, 5439), (4165, 5217), (4403, 4935)]