261401720

素因数分解:

$2^3\times 5^1\times {\mathrm{311}}^1\times {\mathrm{21013}}^1$

素因数の和:21335

約数の個数: 32

約数和(自身を含む): 590073120

約数和(自身を除く): 328671400

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 311, 622, 1244, 1555, 2488, 3110, 6220, 12440, 21013, 42026, 84052, 105065, 168104, 210130, 420260, 840520, 6535043, 13070086, 26140172, 32675215, 52280344, 65350430, 130700860, 261401720]

約数ペア:

[(1, 261401720), (2, 130700860), (4, 65350430), (5, 52280344), (8, 32675215), (10, 26140172), (20, 13070086), (40, 6535043), (311, 840520), (622, 420260), (1244, 210130), (1555, 168104), (2488, 105065), (3110, 84052), (6220, 42026), (12440, 21013)]