20561940

素因数分解:

$2^2\times 3^2\times 5^1\times 7^1\times {\mathrm{16319}}^1$

素因数の和:16341

約数の個数: 72

約数和(自身を含む): 71285760

約数和(自身を除く): 50723820

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 28, 30, 35, 36, 42, 45, 60, 63, 70, 84, 90, 105, 126, 140, 180, 210, 252, 315, 420, 630, 1260, 16319, 32638, 48957, 65276, 81595, 97914, 114233, 146871, 163190, 195828, 228466, 244785, 293742, 326380, 342699, 456932, 489570, 571165, 587484, 685398, 734355, 979140, 1028097, 1142330, 1370796, 1468710, 1713495, 2056194, 2284660, 2937420, 3426990, 4112388, 5140485, 6853980, 10280970, 20561940]

約数ペア:

[(1, 20561940), (2, 10280970), (3, 6853980), (4, 5140485), (5, 4112388), (6, 3426990), (7, 2937420), (9, 2284660), (10, 2056194), (12, 1713495), (14, 1468710), (15, 1370796), (18, 1142330), (20, 1028097), (21, 979140), (28, 734355), (30, 685398), (35, 587484), (36, 571165), (42, 489570), (45, 456932), (60, 342699), (63, 326380), (70, 293742), (84, 244785), (90, 228466), (105, 195828), (126, 163190), (140, 146871), (180, 114233), (210, 97914), (252, 81595), (315, 65276), (420, 48957), (630, 32638), (1260, 16319)]