21400060

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^2\times {\mathrm{37}}^1\times {\mathrm{239}}^1$

素因数の和:307

約数の個数: 72

約数和(自身を含む): 50944320

約数和(自身を除く): 29544260

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 37, 44, 55, 74, 110, 121, 148, 185, 220, 239, 242, 370, 407, 478, 484, 605, 740, 814, 956, 1195, 1210, 1628, 2035, 2390, 2420, 2629, 4070, 4477, 4780, 5258, 8140, 8843, 8954, 10516, 13145, 17686, 17908, 22385, 26290, 28919, 35372, 44215, 44770, 52580, 57838, 88430, 89540, 97273, 115676, 144595, 176860, 194546, 289190, 389092, 486365, 578380, 972730, 1070003, 1945460, 2140006, 4280012, 5350015, 10700030, 21400060]

約数ペア:

[(1, 21400060), (2, 10700030), (4, 5350015), (5, 4280012), (10, 2140006), (11, 1945460), (20, 1070003), (22, 972730), (37, 578380), (44, 486365), (55, 389092), (74, 289190), (110, 194546), (121, 176860), (148, 144595), (185, 115676), (220, 97273), (239, 89540), (242, 88430), (370, 57838), (407, 52580), (478, 44770), (484, 44215), (605, 35372), (740, 28919), (814, 26290), (956, 22385), (1195, 17908), (1210, 17686), (1628, 13145), (2035, 10516), (2390, 8954), (2420, 8843), (2629, 8140), (4070, 5258), (4477, 4780)]