661990

素因数分解:

$2^1\times 5^1\times 7^3\times {\mathrm{193}}^1$

素因数の和:221

約数の個数: 32

約数和(自身を含む): 1396800

約数和(自身を除く): 734810

約数列:

[1, 2, 5, 7, 10, 14, 35, 49, 70, 98, 193, 245, 343, 386, 490, 686, 965, 1351, 1715, 1930, 2702, 3430, 6755, 9457, 13510, 18914, 47285, 66199, 94570, 132398, 330995, 661990]

約数ペア:

[(1, 661990), (2, 330995), (5, 132398), (7, 94570), (10, 66199), (14, 47285), (35, 18914), (49, 13510), (70, 9457), (98, 6755), (193, 3430), (245, 2702), (343, 1930), (386, 1715), (490, 1351), (686, 965)]