21655660

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{43}}^1\times {\mathrm{149}}^1$

素因数の和:227

約数の個数: 72

約数和(自身を含む): 50727600

約数和(自身を除く): 29071940

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 43, 52, 65, 86, 130, 149, 169, 172, 215, 260, 298, 338, 430, 559, 596, 676, 745, 845, 860, 1118, 1490, 1690, 1937, 2236, 2795, 2980, 3380, 3874, 5590, 6407, 7267, 7748, 9685, 11180, 12814, 14534, 19370, 25181, 25628, 29068, 32035, 36335, 38740, 50362, 64070, 72670, 83291, 100724, 125905, 128140, 145340, 166582, 251810, 333164, 416455, 503620, 832910, 1082783, 1665820, 2165566, 4331132, 5413915, 10827830, 21655660]

約数ペア:

[(1, 21655660), (2, 10827830), (4, 5413915), (5, 4331132), (10, 2165566), (13, 1665820), (20, 1082783), (26, 832910), (43, 503620), (52, 416455), (65, 333164), (86, 251810), (130, 166582), (149, 145340), (169, 128140), (172, 125905), (215, 100724), (260, 83291), (298, 72670), (338, 64070), (430, 50362), (559, 38740), (596, 36335), (676, 32035), (745, 29068), (845, 25628), (860, 25181), (1118, 19370), (1490, 14534), (1690, 12814), (1937, 11180), (2236, 9685), (2795, 7748), (2980, 7267), (3380, 6407), (3874, 5590)]