21265720

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{53}}^1\times {\mathrm{1433}}^1$

素因数の和:1504

約数の個数: 64

約数和(自身を含む): 55753920

約数和(自身を除く): 34488200

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 53, 56, 70, 106, 140, 212, 265, 280, 371, 424, 530, 742, 1060, 1433, 1484, 1855, 2120, 2866, 2968, 3710, 5732, 7165, 7420, 10031, 11464, 14330, 14840, 20062, 28660, 40124, 50155, 57320, 75949, 80248, 100310, 151898, 200620, 303796, 379745, 401240, 531643, 607592, 759490, 1063286, 1518980, 2126572, 2658215, 3037960, 4253144, 5316430, 10632860, 21265720]

約数ペア:

[(1, 21265720), (2, 10632860), (4, 5316430), (5, 4253144), (7, 3037960), (8, 2658215), (10, 2126572), (14, 1518980), (20, 1063286), (28, 759490), (35, 607592), (40, 531643), (53, 401240), (56, 379745), (70, 303796), (106, 200620), (140, 151898), (212, 100310), (265, 80248), (280, 75949), (371, 57320), (424, 50155), (530, 40124), (742, 28660), (1060, 20062), (1433, 14840), (1484, 14330), (1855, 11464), (2120, 10031), (2866, 7420), (2968, 7165), (3710, 5732)]