19978010

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{239}}^1\times {\mathrm{643}}^1$

素因数の和:902

約数の個数: 32

約数和(自身を含む): 38949120

約数和(自身を除く): 18971110

約数列:

[1, 2, 5, 10, 13, 26, 65, 130, 239, 478, 643, 1195, 1286, 2390, 3107, 3215, 6214, 6430, 8359, 15535, 16718, 31070, 41795, 83590, 153677, 307354, 768385, 1536770, 1997801, 3995602, 9989005, 19978010]

約数ペア:

[(1, 19978010), (2, 9989005), (5, 3995602), (10, 1997801), (13, 1536770), (26, 768385), (65, 307354), (130, 153677), (239, 83590), (478, 41795), (643, 31070), (1195, 16718), (1286, 15535), (2390, 8359), (3107, 6430), (3215, 6214)]