20818520

素因数分解:

$2^3\times 5^1\times {\mathrm{29}}^1\times {\mathrm{131}}^1\times {\mathrm{137}}^1$

素因数の和:308

約数の個数: 64

約数和(自身を含む): 49183200

約数和(自身を除く): 28364680

約数列:

[1, 2, 4, 5, 8, 10, 20, 29, 40, 58, 116, 131, 137, 145, 232, 262, 274, 290, 524, 548, 580, 655, 685, 1048, 1096, 1160, 1310, 1370, 2620, 2740, 3799, 3973, 5240, 5480, 7598, 7946, 15196, 15892, 17947, 18995, 19865, 30392, 31784, 35894, 37990, 39730, 71788, 75980, 79460, 89735, 143576, 151960, 158920, 179470, 358940, 520463, 717880, 1040926, 2081852, 2602315, 4163704, 5204630, 10409260, 20818520]

約数ペア:

[(1, 20818520), (2, 10409260), (4, 5204630), (5, 4163704), (8, 2602315), (10, 2081852), (20, 1040926), (29, 717880), (40, 520463), (58, 358940), (116, 179470), (131, 158920), (137, 151960), (145, 143576), (232, 89735), (262, 79460), (274, 75980), (290, 71788), (524, 39730), (548, 37990), (580, 35894), (655, 31784), (685, 30392), (1048, 19865), (1096, 18995), (1160, 17947), (1310, 15892), (1370, 15196), (2620, 7946), (2740, 7598), (3799, 5480), (3973, 5240)]