668720

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{643}}^1$

素因数の和:669

約数の個数: 40

約数和(自身を含む): 1676976

約数和(自身を除く): 1008256

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 643, 1040, 1286, 2572, 3215, 5144, 6430, 8359, 10288, 12860, 16718, 25720, 33436, 41795, 51440, 66872, 83590, 133744, 167180, 334360, 668720]

約数ペア:

[(1, 668720), (2, 334360), (4, 167180), (5, 133744), (8, 83590), (10, 66872), (13, 51440), (16, 41795), (20, 33436), (26, 25720), (40, 16718), (52, 12860), (65, 10288), (80, 8359), (104, 6430), (130, 5144), (208, 3215), (260, 2572), (520, 1286), (643, 1040)]