28117420

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{19801}}^1$

素因数の和:19881

約数の個数: 24

約数和(自身を含む): 59881248

約数和(自身を除く): 31763828

約数列:

[1, 2, 4, 5, 10, 20, 71, 142, 284, 355, 710, 1420, 19801, 39602, 79204, 99005, 198010, 396020, 1405871, 2811742, 5623484, 7029355, 14058710, 28117420]

約数ペア:

[(1, 28117420), (2, 14058710), (4, 7029355), (5, 5623484), (10, 2811742), (20, 1405871), (71, 396020), (142, 198010), (284, 99005), (355, 79204), (710, 39602), (1420, 19801)]