21402780

素因数分解:

$2^2\times 3^1\times 5^1\times 7^1\times {\mathrm{131}}^1\times {\mathrm{389}}^1$

素因数の和:539

約数の個数: 96

約数和(自身を含む): 69189120

約数和(自身を除く): 47786340

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 131, 140, 210, 262, 389, 393, 420, 524, 655, 778, 786, 917, 1167, 1310, 1556, 1572, 1834, 1945, 1965, 2334, 2620, 2723, 2751, 3668, 3890, 3930, 4585, 4668, 5446, 5502, 5835, 7780, 7860, 8169, 9170, 10892, 11004, 11670, 13615, 13755, 16338, 18340, 23340, 27230, 27510, 32676, 40845, 50959, 54460, 55020, 81690, 101918, 152877, 163380, 203836, 254795, 305754, 356713, 509590, 611508, 713426, 764385, 1019180, 1070139, 1426852, 1528770, 1783565, 2140278, 3057540, 3567130, 4280556, 5350695, 7134260, 10701390, 21402780]

約数ペア:

[(1, 21402780), (2, 10701390), (3, 7134260), (4, 5350695), (5, 4280556), (6, 3567130), (7, 3057540), (10, 2140278), (12, 1783565), (14, 1528770), (15, 1426852), (20, 1070139), (21, 1019180), (28, 764385), (30, 713426), (35, 611508), (42, 509590), (60, 356713), (70, 305754), (84, 254795), (105, 203836), (131, 163380), (140, 152877), (210, 101918), (262, 81690), (389, 55020), (393, 54460), (420, 50959), (524, 40845), (655, 32676), (778, 27510), (786, 27230), (917, 23340), (1167, 18340), (1310, 16338), (1556, 13755), (1572, 13615), (1834, 11670), (1945, 11004), (1965, 10892), (2334, 9170), (2620, 8169), (2723, 7860), (2751, 7780), (3668, 5835), (3890, 5502), (3930, 5446), (4585, 4668)]