21721840

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{79}}^1\times {\mathrm{491}}^1$

素因数の和:590

約数の個数: 80

約数和(自身を含む): 58567680

約数和(自身を除く): 36845840

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 79, 80, 112, 140, 158, 280, 316, 395, 491, 553, 560, 632, 790, 982, 1106, 1264, 1580, 1964, 2212, 2455, 2765, 3160, 3437, 3928, 4424, 4910, 5530, 6320, 6874, 7856, 8848, 9820, 11060, 13748, 17185, 19640, 22120, 27496, 34370, 38789, 39280, 44240, 54992, 68740, 77578, 137480, 155156, 193945, 271523, 274960, 310312, 387890, 543046, 620624, 775780, 1086092, 1357615, 1551560, 2172184, 2715230, 3103120, 4344368, 5430460, 10860920, 21721840]

約数ペア:

[(1, 21721840), (2, 10860920), (4, 5430460), (5, 4344368), (7, 3103120), (8, 2715230), (10, 2172184), (14, 1551560), (16, 1357615), (20, 1086092), (28, 775780), (35, 620624), (40, 543046), (56, 387890), (70, 310312), (79, 274960), (80, 271523), (112, 193945), (140, 155156), (158, 137480), (280, 77578), (316, 68740), (395, 54992), (491, 44240), (553, 39280), (560, 38789), (632, 34370), (790, 27496), (982, 22120), (1106, 19640), (1264, 17185), (1580, 13748), (1964, 11060), (2212, 9820), (2455, 8848), (2765, 7856), (3160, 6874), (3437, 6320), (3928, 5530), (4424, 4910)]