19880900

素因数分解:

$2^2\times 5^2\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{373}}^1$

素因数の和:441

約数の個数: 72

約数和(自身を含む): 47720904

約数和(自身を除く): 27840004

約数列:

[1, 2, 4, 5, 10, 13, 20, 25, 26, 41, 50, 52, 65, 82, 100, 130, 164, 205, 260, 325, 373, 410, 533, 650, 746, 820, 1025, 1066, 1300, 1492, 1865, 2050, 2132, 2665, 3730, 4100, 4849, 5330, 7460, 9325, 9698, 10660, 13325, 15293, 18650, 19396, 24245, 26650, 30586, 37300, 48490, 53300, 61172, 76465, 96980, 121225, 152930, 198809, 242450, 305860, 382325, 397618, 484900, 764650, 795236, 994045, 1529300, 1988090, 3976180, 4970225, 9940450, 19880900]

約数ペア:

[(1, 19880900), (2, 9940450), (4, 4970225), (5, 3976180), (10, 1988090), (13, 1529300), (20, 994045), (25, 795236), (26, 764650), (41, 484900), (50, 397618), (52, 382325), (65, 305860), (82, 242450), (100, 198809), (130, 152930), (164, 121225), (205, 96980), (260, 76465), (325, 61172), (373, 53300), (410, 48490), (533, 37300), (650, 30586), (746, 26650), (820, 24245), (1025, 19396), (1066, 18650), (1300, 15293), (1492, 13325), (1865, 10660), (2050, 9698), (2132, 9325), (2665, 7460), (3730, 5330), (4100, 4849)]