20111221

素因数分解:

${\mathrm{13}}^1\times {\mathrm{17}}^2\times {\mathrm{53}}^1\times {\mathrm{101}}^1$

素因数の和:201

約数の個数: 24

約数和(自身を含む): 23673384

約数和(自身を除く): 3562163

約数列:

[1, 13, 17, 53, 101, 221, 289, 689, 901, 1313, 1717, 3757, 5353, 11713, 15317, 22321, 29189, 69589, 91001, 199121, 379457, 1183013, 1547017, 20111221]

約数ペア:

[(1, 20111221), (13, 1547017), (17, 1183013), (53, 379457), (101, 199121), (221, 91001), (289, 69589), (689, 29189), (901, 22321), (1313, 15317), (1717, 11713), (3757, 5353)]