21721240

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^2\times {\mathrm{1879}}^1$

素因数の和:1924

約数の個数: 48

約数和(自身を含む): 51944400

約数和(自身を除く): 30223160

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 170, 289, 340, 578, 680, 1156, 1445, 1879, 2312, 2890, 3758, 5780, 7516, 9395, 11560, 15032, 18790, 31943, 37580, 63886, 75160, 127772, 159715, 255544, 319430, 543031, 638860, 1086062, 1277720, 2172124, 2715155, 4344248, 5430310, 10860620, 21721240]

約数ペア:

[(1, 21721240), (2, 10860620), (4, 5430310), (5, 4344248), (8, 2715155), (10, 2172124), (17, 1277720), (20, 1086062), (34, 638860), (40, 543031), (68, 319430), (85, 255544), (136, 159715), (170, 127772), (289, 75160), (340, 63886), (578, 37580), (680, 31943), (1156, 18790), (1445, 15032), (1879, 11560), (2312, 9395), (2890, 7516), (3758, 5780)]