21609915

素因数分解:

$3^1\times 5^1\times {\mathrm{71}}^1\times {\mathrm{103}}^1\times {\mathrm{197}}^1$

素因数の和:379

約数の個数: 32

約数和(自身を含む): 35582976

約数和(自身を除く): 13973061

約数列:

[1, 3, 5, 15, 71, 103, 197, 213, 309, 355, 515, 591, 985, 1065, 1545, 2955, 7313, 13987, 20291, 21939, 36565, 41961, 60873, 69935, 101455, 109695, 209805, 304365, 1440661, 4321983, 7203305, 21609915]

約数ペア:

[(1, 21609915), (3, 7203305), (5, 4321983), (15, 1440661), (71, 304365), (103, 209805), (197, 109695), (213, 101455), (309, 69935), (355, 60873), (515, 41961), (591, 36565), (985, 21939), (1065, 20291), (1545, 13987), (2955, 7313)]