21980140

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{13}}^2\times {\mathrm{929}}^1$

素因数の和:971

約数の個数: 72

約数和(自身を含む): 57183840

約数和(自身を除く): 35203700

約数列:

[1, 2, 4, 5, 7, 10, 13, 14, 20, 26, 28, 35, 52, 65, 70, 91, 130, 140, 169, 182, 260, 338, 364, 455, 676, 845, 910, 929, 1183, 1690, 1820, 1858, 2366, 3380, 3716, 4645, 4732, 5915, 6503, 9290, 11830, 12077, 13006, 18580, 23660, 24154, 26012, 32515, 48308, 60385, 65030, 84539, 120770, 130060, 157001, 169078, 241540, 314002, 338156, 422695, 628004, 785005, 845390, 1099007, 1570010, 1690780, 2198014, 3140020, 4396028, 5495035, 10990070, 21980140]

約数ペア:

[(1, 21980140), (2, 10990070), (4, 5495035), (5, 4396028), (7, 3140020), (10, 2198014), (13, 1690780), (14, 1570010), (20, 1099007), (26, 845390), (28, 785005), (35, 628004), (52, 422695), (65, 338156), (70, 314002), (91, 241540), (130, 169078), (140, 157001), (169, 130060), (182, 120770), (260, 84539), (338, 65030), (364, 60385), (455, 48308), (676, 32515), (845, 26012), (910, 24154), (929, 23660), (1183, 18580), (1690, 13006), (1820, 12077), (1858, 11830), (2366, 9290), (3380, 6503), (3716, 5915), (4645, 4732)]