21920920

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{79}}^1\times {\mathrm{991}}^1$

素因数の和:1088

約数の個数: 64

約数和(自身を含む): 57139200

約数和(自身を除く): 35218280

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 79, 140, 158, 280, 316, 395, 553, 632, 790, 991, 1106, 1580, 1982, 2212, 2765, 3160, 3964, 4424, 4955, 5530, 6937, 7928, 9910, 11060, 13874, 19820, 22120, 27748, 34685, 39640, 55496, 69370, 78289, 138740, 156578, 277480, 313156, 391445, 548023, 626312, 782890, 1096046, 1565780, 2192092, 2740115, 3131560, 4384184, 5480230, 10960460, 21920920]

約数ペア:

[(1, 21920920), (2, 10960460), (4, 5480230), (5, 4384184), (7, 3131560), (8, 2740115), (10, 2192092), (14, 1565780), (20, 1096046), (28, 782890), (35, 626312), (40, 548023), (56, 391445), (70, 313156), (79, 277480), (140, 156578), (158, 138740), (280, 78289), (316, 69370), (395, 55496), (553, 39640), (632, 34685), (790, 27748), (991, 22120), (1106, 19820), (1580, 13874), (1982, 11060), (2212, 9910), (2765, 7928), (3160, 6937), (3964, 5530), (4424, 4955)]