21812980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{4211}}^1$

素因数の和:4264

約数の個数: 48

約数和(自身を含む): 53778816

約数和(自身を除く): 31965836

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 37, 70, 74, 140, 148, 185, 259, 370, 518, 740, 1036, 1295, 2590, 4211, 5180, 8422, 16844, 21055, 29477, 42110, 58954, 84220, 117908, 147385, 155807, 294770, 311614, 589540, 623228, 779035, 1090649, 1558070, 2181298, 3116140, 4362596, 5453245, 10906490, 21812980]

約数ペア:

[(1, 21812980), (2, 10906490), (4, 5453245), (5, 4362596), (7, 3116140), (10, 2181298), (14, 1558070), (20, 1090649), (28, 779035), (35, 623228), (37, 589540), (70, 311614), (74, 294770), (140, 155807), (148, 147385), (185, 117908), (259, 84220), (370, 58954), (518, 42110), (740, 29477), (1036, 21055), (1295, 16844), (2590, 8422), (4211, 5180)]