20157568720

素因数分解:

$2^4\times 5^1\times {\mathrm{139}}^1\times {\mathrm{281}}^1\times {\mathrm{6451}}^1$

素因数の和:6884

約数の個数: 80

約数和(自身を含む): 47378842560

約数和(自身を除く): 27221273840

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 139, 278, 281, 556, 562, 695, 1112, 1124, 1390, 1405, 2224, 2248, 2780, 2810, 4496, 5560, 5620, 6451, 11120, 11240, 12902, 22480, 25804, 32255, 39059, 51608, 64510, 78118, 103216, 129020, 156236, 195295, 258040, 312472, 390590, 516080, 624944, 781180, 896689, 1562360, 1793378, 1812731, 3124720, 3586756, 3625462, 4483445, 7173512, 7250924, 8966890, 9063655, 14347024, 14501848, 17933780, 18127310, 29003696, 35867560, 36254620, 71735120, 72509240, 145018480, 251969609, 503939218, 1007878436, 1259848045, 2015756872, 2519696090, 4031513744, 5039392180, 10078784360, 20157568720]

約数ペア:

[(1, 20157568720), (2, 10078784360), (4, 5039392180), (5, 4031513744), (8, 2519696090), (10, 2015756872), (16, 1259848045), (20, 1007878436), (40, 503939218), (80, 251969609), (139, 145018480), (278, 72509240), (281, 71735120), (556, 36254620), (562, 35867560), (695, 29003696), (1112, 18127310), (1124, 17933780), (1390, 14501848), (1405, 14347024), (2224, 9063655), (2248, 8966890), (2780, 7250924), (2810, 7173512), (4496, 4483445), (5560, 3625462), (5620, 3586756), (6451, 3124720), (11120, 1812731), (11240, 1793378), (12902, 1562360), (22480, 896689), (25804, 781180), (32255, 624944), (39059, 516080), (51608, 390590), (64510, 312472), (78118, 258040), (103216, 195295), (129020, 156236)]