21138920

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{107}}^1\times {\mathrm{449}}^1$

素因数の和:578

約数の個数: 64

約数和(自身を含む): 52488000

約数和(自身を除く): 31349080

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 107, 110, 214, 220, 428, 440, 449, 535, 856, 898, 1070, 1177, 1796, 2140, 2245, 2354, 3592, 4280, 4490, 4708, 4939, 5885, 8980, 9416, 9878, 11770, 17960, 19756, 23540, 24695, 39512, 47080, 48043, 49390, 96086, 98780, 192172, 197560, 240215, 384344, 480430, 528473, 960860, 1056946, 1921720, 2113892, 2642365, 4227784, 5284730, 10569460, 21138920]

約数ペア:

[(1, 21138920), (2, 10569460), (4, 5284730), (5, 4227784), (8, 2642365), (10, 2113892), (11, 1921720), (20, 1056946), (22, 960860), (40, 528473), (44, 480430), (55, 384344), (88, 240215), (107, 197560), (110, 192172), (214, 98780), (220, 96086), (428, 49390), (440, 48043), (449, 47080), (535, 39512), (856, 24695), (898, 23540), (1070, 19756), (1177, 17960), (1796, 11770), (2140, 9878), (2245, 9416), (2354, 8980), (3592, 5885), (4280, 4939), (4490, 4708)]