21687940

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{61}}^1\times {\mathrm{613}}^1$

素因数の和:712

約数の個数: 48

約数和(自身を含む): 47965680

約数和(自身を除く): 26277740

約数列:

[1, 2, 4, 5, 10, 20, 29, 58, 61, 116, 122, 145, 244, 290, 305, 580, 610, 613, 1220, 1226, 1769, 2452, 3065, 3538, 6130, 7076, 8845, 12260, 17690, 17777, 35380, 35554, 37393, 71108, 74786, 88885, 149572, 177770, 186965, 355540, 373930, 747860, 1084397, 2168794, 4337588, 5421985, 10843970, 21687940]

約数ペア:

[(1, 21687940), (2, 10843970), (4, 5421985), (5, 4337588), (10, 2168794), (20, 1084397), (29, 747860), (58, 373930), (61, 355540), (116, 186965), (122, 177770), (145, 149572), (244, 88885), (290, 74786), (305, 71108), (580, 37393), (610, 35554), (613, 35380), (1220, 17777), (1226, 17690), (1769, 12260), (2452, 8845), (3065, 7076), (3538, 6130)]