21961720

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{71}}^1$

素因数の和:149

約数の個数: 128

約数和(自身を含む): 59097600

約数和(自身を除く): 37135880

約数列:

[1, 2, 4, 5, 8, 10, 11, 19, 20, 22, 37, 38, 40, 44, 55, 71, 74, 76, 88, 95, 110, 142, 148, 152, 185, 190, 209, 220, 284, 296, 355, 370, 380, 407, 418, 440, 568, 703, 710, 740, 760, 781, 814, 836, 1045, 1349, 1406, 1420, 1480, 1562, 1628, 1672, 2035, 2090, 2627, 2698, 2812, 2840, 3124, 3256, 3515, 3905, 4070, 4180, 5254, 5396, 5624, 6248, 6745, 7030, 7733, 7810, 8140, 8360, 10508, 10792, 13135, 13490, 14060, 14839, 15466, 15620, 16280, 21016, 26270, 26980, 28120, 28897, 29678, 30932, 31240, 38665, 49913, 52540, 53960, 57794, 59356, 61864, 74195, 77330, 99826, 105080, 115588, 118712, 144485, 148390, 154660, 199652, 231176, 249565, 288970, 296780, 309320, 399304, 499130, 549043, 577940, 593560, 998260, 1098086, 1155880, 1996520, 2196172, 2745215, 4392344, 5490430, 10980860, 21961720]

約数ペア:

[(1, 21961720), (2, 10980860), (4, 5490430), (5, 4392344), (8, 2745215), (10, 2196172), (11, 1996520), (19, 1155880), (20, 1098086), (22, 998260), (37, 593560), (38, 577940), (40, 549043), (44, 499130), (55, 399304), (71, 309320), (74, 296780), (76, 288970), (88, 249565), (95, 231176), (110, 199652), (142, 154660), (148, 148390), (152, 144485), (185, 118712), (190, 115588), (209, 105080), (220, 99826), (284, 77330), (296, 74195), (355, 61864), (370, 59356), (380, 57794), (407, 53960), (418, 52540), (440, 49913), (568, 38665), (703, 31240), (710, 30932), (740, 29678), (760, 28897), (781, 28120), (814, 26980), (836, 26270), (1045, 21016), (1349, 16280), (1406, 15620), (1420, 15466), (1480, 14839), (1562, 14060), (1628, 13490), (1672, 13135), (2035, 10792), (2090, 10508), (2627, 8360), (2698, 8140), (2812, 7810), (2840, 7733), (3124, 7030), (3256, 6745), (3515, 6248), (3905, 5624), (4070, 5396), (4180, 5254)]