21240340

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^2\times {\mathrm{67}}^1\times {\mathrm{131}}^1$

素因数の和:229

約数の個数: 72

約数和(自身を含む): 50139936

約数和(自身を除く): 28899596

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 67, 110, 121, 131, 134, 220, 242, 262, 268, 335, 484, 524, 605, 655, 670, 737, 1210, 1310, 1340, 1441, 1474, 2420, 2620, 2882, 2948, 3685, 5764, 7205, 7370, 8107, 8777, 14410, 14740, 15851, 16214, 17554, 28820, 31702, 32428, 35108, 40535, 43885, 63404, 79255, 81070, 87770, 96547, 158510, 162140, 175540, 193094, 317020, 386188, 482735, 965470, 1062017, 1930940, 2124034, 4248068, 5310085, 10620170, 21240340]

約数ペア:

[(1, 21240340), (2, 10620170), (4, 5310085), (5, 4248068), (10, 2124034), (11, 1930940), (20, 1062017), (22, 965470), (44, 482735), (55, 386188), (67, 317020), (110, 193094), (121, 175540), (131, 162140), (134, 158510), (220, 96547), (242, 87770), (262, 81070), (268, 79255), (335, 63404), (484, 43885), (524, 40535), (605, 35108), (655, 32428), (670, 31702), (737, 28820), (1210, 17554), (1310, 16214), (1340, 15851), (1441, 14740), (1474, 14410), (2420, 8777), (2620, 8107), (2882, 7370), (2948, 7205), (3685, 5764)]