20172740

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{89}}^1\times {\mathrm{1619}}^1$

素因数の和:1724

約数の個数: 48

約数和(自身を含む): 48988800

約数和(自身を除く): 28816060

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 89, 140, 178, 356, 445, 623, 890, 1246, 1619, 1780, 2492, 3115, 3238, 6230, 6476, 8095, 11333, 12460, 16190, 22666, 32380, 45332, 56665, 113330, 144091, 226660, 288182, 576364, 720455, 1008637, 1440910, 2017274, 2881820, 4034548, 5043185, 10086370, 20172740]

約数ペア:

[(1, 20172740), (2, 10086370), (4, 5043185), (5, 4034548), (7, 2881820), (10, 2017274), (14, 1440910), (20, 1008637), (28, 720455), (35, 576364), (70, 288182), (89, 226660), (140, 144091), (178, 113330), (356, 56665), (445, 45332), (623, 32380), (890, 22666), (1246, 16190), (1619, 12460), (1780, 11333), (2492, 8095), (3115, 6476), (3238, 6230)]