20961765

素因数分解:

$3^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{53}}^1$

素因数の和:139

約数の個数: 96

約数和(自身を含む): 43670016

約数和(自身を除く): 22708251

約数列:

[1, 3, 5, 9, 11, 15, 17, 33, 45, 47, 51, 53, 55, 85, 99, 141, 153, 159, 165, 187, 235, 255, 265, 423, 477, 495, 517, 561, 583, 705, 765, 795, 799, 901, 935, 1551, 1683, 1749, 2115, 2385, 2397, 2491, 2585, 2703, 2805, 2915, 3995, 4505, 4653, 5247, 7191, 7473, 7755, 8109, 8415, 8745, 8789, 9911, 11985, 12455, 13515, 22419, 23265, 26235, 26367, 27401, 29733, 35955, 37365, 40545, 42347, 43945, 49555, 79101, 82203, 89199, 112095, 127041, 131835, 137005, 148665, 211735, 246609, 381123, 395505, 411015, 445995, 465817, 635205, 1233045, 1397451, 1905615, 2329085, 4192353, 6987255, 20961765]

約数ペア:

[(1, 20961765), (3, 6987255), (5, 4192353), (9, 2329085), (11, 1905615), (15, 1397451), (17, 1233045), (33, 635205), (45, 465817), (47, 445995), (51, 411015), (53, 395505), (55, 381123), (85, 246609), (99, 211735), (141, 148665), (153, 137005), (159, 131835), (165, 127041), (187, 112095), (235, 89199), (255, 82203), (265, 79101), (423, 49555), (477, 43945), (495, 42347), (517, 40545), (561, 37365), (583, 35955), (705, 29733), (765, 27401), (795, 26367), (799, 26235), (901, 23265), (935, 22419), (1551, 13515), (1683, 12455), (1749, 11985), (2115, 9911), (2385, 8789), (2397, 8745), (2491, 8415), (2585, 8109), (2703, 7755), (2805, 7473), (2915, 7191), (3995, 5247), (4505, 4653)]