397420

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{641}}^1$

素因数の和:681

約数の個数: 24

約数和(自身を含む): 862848

約数和(自身を除く): 465428

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 124, 155, 310, 620, 641, 1282, 2564, 3205, 6410, 12820, 19871, 39742, 79484, 99355, 198710, 397420]

約数ペア:

[(1, 397420), (2, 198710), (4, 99355), (5, 79484), (10, 39742), (20, 19871), (31, 12820), (62, 6410), (124, 3205), (155, 2564), (310, 1282), (620, 641)]