21228305

素因数分解:

$5^1\times 7^1\times {\mathrm{61}}^2\times {\mathrm{163}}^1$

素因数の和:297

約数の個数: 24

約数和(自身を含む): 29779776

約数和(自身を除く): 8551471

約数列:

[1, 5, 7, 35, 61, 163, 305, 427, 815, 1141, 2135, 3721, 5705, 9943, 18605, 26047, 49715, 69601, 130235, 348005, 606523, 3032615, 4245661, 21228305]

約数ペア:

[(1, 21228305), (5, 4245661), (7, 3032615), (35, 606523), (61, 348005), (163, 130235), (305, 69601), (427, 49715), (815, 26047), (1141, 18605), (2135, 9943), (3721, 5705)]