21257327

素因数分解:

$7^2\times {\mathrm{13}}^2\times {\mathrm{17}}^1\times {\mathrm{151}}^1$

素因数の和:208

約数の個数: 36

約数和(自身を含む): 28539216

約数和(自身を除く): 7281889

約数列:

[1, 7, 13, 17, 49, 91, 119, 151, 169, 221, 637, 833, 1057, 1183, 1547, 1963, 2567, 2873, 7399, 8281, 10829, 13741, 17969, 20111, 25519, 33371, 96187, 125783, 140777, 178633, 233597, 433823, 1250431, 1635179, 3036761, 21257327]

約数ペア:

[(1, 21257327), (7, 3036761), (13, 1635179), (17, 1250431), (49, 433823), (91, 233597), (119, 178633), (151, 140777), (169, 125783), (221, 96187), (637, 33371), (833, 25519), (1057, 20111), (1183, 17969), (1547, 13741), (1963, 10829), (2567, 8281), (2873, 7399)]