21751240

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{131}}^1\times {\mathrm{593}}^1$

素因数の和:742

約数の個数: 64

約数和(自身を含む): 56453760

約数和(自身を除く): 34702520

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 131, 140, 262, 280, 524, 593, 655, 917, 1048, 1186, 1310, 1834, 2372, 2620, 2965, 3668, 4151, 4585, 4744, 5240, 5930, 7336, 8302, 9170, 11860, 16604, 18340, 20755, 23720, 33208, 36680, 41510, 77683, 83020, 155366, 166040, 310732, 388415, 543781, 621464, 776830, 1087562, 1553660, 2175124, 2718905, 3107320, 4350248, 5437810, 10875620, 21751240]

約数ペア:

[(1, 21751240), (2, 10875620), (4, 5437810), (5, 4350248), (7, 3107320), (8, 2718905), (10, 2175124), (14, 1553660), (20, 1087562), (28, 776830), (35, 621464), (40, 543781), (56, 388415), (70, 310732), (131, 166040), (140, 155366), (262, 83020), (280, 77683), (524, 41510), (593, 36680), (655, 33208), (917, 23720), (1048, 20755), (1186, 18340), (1310, 16604), (1834, 11860), (2372, 9170), (2620, 8302), (2965, 7336), (3668, 5930), (4151, 5240), (4585, 4744)]