21393351

素因数分解:

$3^2\times 7^2\times {\mathrm{139}}^1\times {\mathrm{349}}^1$

素因数の和:508

約数の個数: 36

約数和(自身を含む): 36309000

約数和(自身を除く): 14915649

約数列:

[1, 3, 7, 9, 21, 49, 63, 139, 147, 349, 417, 441, 973, 1047, 1251, 2443, 2919, 3141, 6811, 7329, 8757, 17101, 20433, 21987, 48511, 51303, 61299, 145533, 153909, 339577, 436599, 1018731, 2377039, 3056193, 7131117, 21393351]

約数ペア:

[(1, 21393351), (3, 7131117), (7, 3056193), (9, 2377039), (21, 1018731), (49, 436599), (63, 339577), (139, 153909), (147, 145533), (349, 61299), (417, 51303), (441, 48511), (973, 21987), (1047, 20433), (1251, 17101), (2443, 8757), (2919, 7329), (3141, 6811)]