19818700

素因数分解:

$2^2\times 5^2\times {\mathrm{11}}^1\times {\mathrm{43}}^1\times {\mathrm{419}}^1$

素因数の和:487

約数の個数: 72

約数和(自身を含む): 48121920

約数和(自身を除く): 28303220

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 25, 43, 44, 50, 55, 86, 100, 110, 172, 215, 220, 275, 419, 430, 473, 550, 838, 860, 946, 1075, 1100, 1676, 1892, 2095, 2150, 2365, 4190, 4300, 4609, 4730, 8380, 9218, 9460, 10475, 11825, 18017, 18436, 20950, 23045, 23650, 36034, 41900, 46090, 47300, 72068, 90085, 92180, 115225, 180170, 198187, 230450, 360340, 396374, 450425, 460900, 792748, 900850, 990935, 1801700, 1981870, 3963740, 4954675, 9909350, 19818700]

約数ペア:

[(1, 19818700), (2, 9909350), (4, 4954675), (5, 3963740), (10, 1981870), (11, 1801700), (20, 990935), (22, 900850), (25, 792748), (43, 460900), (44, 450425), (50, 396374), (55, 360340), (86, 230450), (100, 198187), (110, 180170), (172, 115225), (215, 92180), (220, 90085), (275, 72068), (419, 47300), (430, 46090), (473, 41900), (550, 36034), (838, 23650), (860, 23045), (946, 20950), (1075, 18436), (1100, 18017), (1676, 11825), (1892, 10475), (2095, 9460), (2150, 9218), (2365, 8380), (4190, 4730), (4300, 4609)]