21237720

素因数分解:

$2^3\times 3^1\times 5^1\times 7^1\times {\mathrm{131}}^1\times {\mathrm{193}}^1$

素因数の和:345

約数の個数: 128

約数和(自身を含む): 73751040

約数和(自身を除く): 52513320

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 56, 60, 70, 84, 105, 120, 131, 140, 168, 193, 210, 262, 280, 386, 393, 420, 524, 579, 655, 772, 786, 840, 917, 965, 1048, 1158, 1310, 1351, 1544, 1572, 1834, 1930, 1965, 2316, 2620, 2702, 2751, 2895, 3144, 3668, 3860, 3930, 4053, 4585, 4632, 5240, 5404, 5502, 5790, 6755, 7336, 7720, 7860, 8106, 9170, 10808, 11004, 11580, 13510, 13755, 15720, 16212, 18340, 20265, 22008, 23160, 25283, 27020, 27510, 32424, 36680, 40530, 50566, 54040, 55020, 75849, 81060, 101132, 110040, 126415, 151698, 162120, 176981, 202264, 252830, 303396, 353962, 379245, 505660, 530943, 606792, 707924, 758490, 884905, 1011320, 1061886, 1415848, 1516980, 1769810, 2123772, 2654715, 3033960, 3539620, 4247544, 5309430, 7079240, 10618860, 21237720]

約数ペア:

[(1, 21237720), (2, 10618860), (3, 7079240), (4, 5309430), (5, 4247544), (6, 3539620), (7, 3033960), (8, 2654715), (10, 2123772), (12, 1769810), (14, 1516980), (15, 1415848), (20, 1061886), (21, 1011320), (24, 884905), (28, 758490), (30, 707924), (35, 606792), (40, 530943), (42, 505660), (56, 379245), (60, 353962), (70, 303396), (84, 252830), (105, 202264), (120, 176981), (131, 162120), (140, 151698), (168, 126415), (193, 110040), (210, 101132), (262, 81060), (280, 75849), (386, 55020), (393, 54040), (420, 50566), (524, 40530), (579, 36680), (655, 32424), (772, 27510), (786, 27020), (840, 25283), (917, 23160), (965, 22008), (1048, 20265), (1158, 18340), (1310, 16212), (1351, 15720), (1544, 13755), (1572, 13510), (1834, 11580), (1930, 11004), (1965, 10808), (2316, 9170), (2620, 8106), (2702, 7860), (2751, 7720), (2895, 7336), (3144, 6755), (3668, 5790), (3860, 5502), (3930, 5404), (4053, 5240), (4585, 4632)]