128990920

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{78653}}^1$

素因数の和:78705

約数の個数: 32

約数和(自身を含む): 297312120

約数和(自身を除く): 168321200

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 78653, 157306, 314612, 393265, 629224, 786530, 1573060, 3146120, 3224773, 6449546, 12899092, 16123865, 25798184, 32247730, 64495460, 128990920]

約数ペア:

[(1, 128990920), (2, 64495460), (4, 32247730), (5, 25798184), (8, 16123865), (10, 12899092), (20, 6449546), (40, 3224773), (41, 3146120), (82, 1573060), (164, 786530), (205, 629224), (328, 393265), (410, 314612), (820, 157306), (1640, 78653)]