20155660

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{131}}^1\times {\mathrm{157}}^1$

素因数の和:311

約数の個数: 72

約数和(自身を含む): 49929264

約数和(自身を除く): 29773604

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 131, 140, 157, 196, 245, 262, 314, 490, 524, 628, 655, 785, 917, 980, 1099, 1310, 1570, 1834, 2198, 2620, 3140, 3668, 4396, 4585, 5495, 6419, 7693, 9170, 10990, 12838, 15386, 18340, 20567, 21980, 25676, 30772, 32095, 38465, 41134, 64190, 76930, 82268, 102835, 128380, 143969, 153860, 205670, 287938, 411340, 575876, 719845, 1007783, 1439690, 2015566, 2879380, 4031132, 5038915, 10077830, 20155660]

約数ペア:

[(1, 20155660), (2, 10077830), (4, 5038915), (5, 4031132), (7, 2879380), (10, 2015566), (14, 1439690), (20, 1007783), (28, 719845), (35, 575876), (49, 411340), (70, 287938), (98, 205670), (131, 153860), (140, 143969), (157, 128380), (196, 102835), (245, 82268), (262, 76930), (314, 64190), (490, 41134), (524, 38465), (628, 32095), (655, 30772), (785, 25676), (917, 21980), (980, 20567), (1099, 18340), (1310, 15386), (1570, 12838), (1834, 10990), (2198, 9170), (2620, 7693), (3140, 6419), (3668, 5495), (4396, 4585)]