81407740

素因数分解:

$2^2\times 5^1\times {\mathrm{107}}^1\times {\mathrm{109}}^1\times {\mathrm{349}}^1$

素因数の和:574

約数の個数: 48

約数和(自身を含む): 174636000

約数和(自身を除く): 93228260

約数列:

[1, 2, 4, 5, 10, 20, 107, 109, 214, 218, 349, 428, 436, 535, 545, 698, 1070, 1090, 1396, 1745, 2140, 2180, 3490, 6980, 11663, 23326, 37343, 38041, 46652, 58315, 74686, 76082, 116630, 149372, 152164, 186715, 190205, 233260, 373430, 380410, 746860, 760820, 4070387, 8140774, 16281548, 20351935, 40703870, 81407740]

約数ペア:

[(1, 81407740), (2, 40703870), (4, 20351935), (5, 16281548), (10, 8140774), (20, 4070387), (107, 760820), (109, 746860), (214, 380410), (218, 373430), (349, 233260), (428, 190205), (436, 186715), (535, 152164), (545, 149372), (698, 116630), (1070, 76082), (1090, 74686), (1396, 58315), (1745, 46652), (2140, 38041), (2180, 37343), (3490, 23326), (6980, 11663)]