20390715

素因数分解:

$3^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{47}}^1\times {\mathrm{311}}^1$

素因数の和:400

約数の個数: 48

約数和(自身を含む): 37380096

約数和(自身を除く): 16989381

約数列:

[1, 3, 5, 9, 15, 31, 45, 47, 93, 141, 155, 235, 279, 311, 423, 465, 705, 933, 1395, 1457, 1555, 2115, 2799, 4371, 4665, 7285, 9641, 13113, 13995, 14617, 21855, 28923, 43851, 48205, 65565, 73085, 86769, 131553, 144615, 219255, 433845, 453127, 657765, 1359381, 2265635, 4078143, 6796905, 20390715]

約数ペア:

[(1, 20390715), (3, 6796905), (5, 4078143), (9, 2265635), (15, 1359381), (31, 657765), (45, 453127), (47, 433845), (93, 219255), (141, 144615), (155, 131553), (235, 86769), (279, 73085), (311, 65565), (423, 48205), (465, 43851), (705, 28923), (933, 21855), (1395, 14617), (1457, 13995), (1555, 13113), (2115, 9641), (2799, 7285), (4371, 4665)]