640755

素因数分解:

$3^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{491}}^1$

素因数の和:531

約数の個数: 24

約数和(自身を含む): 1151280

約数和(自身を除く): 510525

約数列:

[1, 3, 5, 9, 15, 29, 45, 87, 145, 261, 435, 491, 1305, 1473, 2455, 4419, 7365, 14239, 22095, 42717, 71195, 128151, 213585, 640755]

約数ペア:

[(1, 640755), (3, 213585), (5, 128151), (9, 71195), (15, 42717), (29, 22095), (45, 14239), (87, 7365), (145, 4419), (261, 2455), (435, 1473), (491, 1305)]