21369880

素因数分解:

$2^3\times 5^1\times 7^2\times {\mathrm{10903}}^1$

素因数の和:10928

約数の個数: 48

約数和(自身を含む): 55937520

約数和(自身を除く): 34567640

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 49, 56, 70, 98, 140, 196, 245, 280, 392, 490, 980, 1960, 10903, 21806, 43612, 54515, 76321, 87224, 109030, 152642, 218060, 305284, 381605, 436120, 534247, 610568, 763210, 1068494, 1526420, 2136988, 2671235, 3052840, 4273976, 5342470, 10684940, 21369880]

約数ペア:

[(1, 21369880), (2, 10684940), (4, 5342470), (5, 4273976), (7, 3052840), (8, 2671235), (10, 2136988), (14, 1526420), (20, 1068494), (28, 763210), (35, 610568), (40, 534247), (49, 436120), (56, 381605), (70, 305284), (98, 218060), (140, 152642), (196, 109030), (245, 87224), (280, 76321), (392, 54515), (490, 43612), (980, 21806), (1960, 10903)]