81388280

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{49627}}^1$

素因数の和:49679

約数の個数: 32

約数和(自身を含む): 187593840

約数和(自身を除く): 106205560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 49627, 99254, 198508, 248135, 397016, 496270, 992540, 1985080, 2034707, 4069414, 8138828, 10173535, 16277656, 20347070, 40694140, 81388280]

約数ペア:

[(1, 81388280), (2, 40694140), (4, 20347070), (5, 16277656), (8, 10173535), (10, 8138828), (20, 4069414), (40, 2034707), (41, 1985080), (82, 992540), (164, 496270), (205, 397016), (328, 248135), (410, 198508), (820, 99254), (1640, 49627)]