21506660

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{149}}^1\times {\mathrm{1031}}^1$

素因数の和:1196

約数の個数: 48

約数和(自身を含む): 52012800

約数和(自身を除く): 30506140

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 149, 298, 596, 745, 1031, 1043, 1490, 2062, 2086, 2980, 4124, 4172, 5155, 5215, 7217, 10310, 10430, 14434, 20620, 20860, 28868, 36085, 72170, 144340, 153619, 307238, 614476, 768095, 1075333, 1536190, 2150666, 3072380, 4301332, 5376665, 10753330, 21506660]

約数ペア:

[(1, 21506660), (2, 10753330), (4, 5376665), (5, 4301332), (7, 3072380), (10, 2150666), (14, 1536190), (20, 1075333), (28, 768095), (35, 614476), (70, 307238), (140, 153619), (149, 144340), (298, 72170), (596, 36085), (745, 28868), (1031, 20860), (1043, 20620), (1490, 14434), (2062, 10430), (2086, 10310), (2980, 7217), (4124, 5215), (4172, 5155)]