664420

素因数分解:

$2^2\times 5^1\times {\mathrm{139}}^1\times {\mathrm{239}}^1$

素因数の和:387

約数の個数: 24

約数和(自身を含む): 1411200

約数和(自身を除く): 746780

約数列:

[1, 2, 4, 5, 10, 20, 139, 239, 278, 478, 556, 695, 956, 1195, 1390, 2390, 2780, 4780, 33221, 66442, 132884, 166105, 332210, 664420]

約数ペア:

[(1, 664420), (2, 332210), (4, 166105), (5, 132884), (10, 66442), (20, 33221), (139, 4780), (239, 2780), (278, 2390), (478, 1390), (556, 1195), (695, 956)]