19780900

素因数分解:

$2^2\times 5^2\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{359}}^1$

素因数の和:421

約数の個数: 72

約数和(自身を含む): 46872000

約数和(自身を除く): 27091100

約数列:

[1, 2, 4, 5, 10, 19, 20, 25, 29, 38, 50, 58, 76, 95, 100, 116, 145, 190, 290, 359, 380, 475, 551, 580, 718, 725, 950, 1102, 1436, 1450, 1795, 1900, 2204, 2755, 2900, 3590, 5510, 6821, 7180, 8975, 10411, 11020, 13642, 13775, 17950, 20822, 27284, 27550, 34105, 35900, 41644, 52055, 55100, 68210, 104110, 136420, 170525, 197809, 208220, 260275, 341050, 395618, 520550, 682100, 791236, 989045, 1041100, 1978090, 3956180, 4945225, 9890450, 19780900]

約数ペア:

[(1, 19780900), (2, 9890450), (4, 4945225), (5, 3956180), (10, 1978090), (19, 1041100), (20, 989045), (25, 791236), (29, 682100), (38, 520550), (50, 395618), (58, 341050), (76, 260275), (95, 208220), (100, 197809), (116, 170525), (145, 136420), (190, 104110), (290, 68210), (359, 55100), (380, 52055), (475, 41644), (551, 35900), (580, 34105), (718, 27550), (725, 27284), (950, 20822), (1102, 17950), (1436, 13775), (1450, 13642), (1795, 11020), (1900, 10411), (2204, 8975), (2755, 7180), (2900, 6821), (3590, 5510)]