21640449

素因数分解:

$3^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{37}}^1\times {\mathrm{331}}^1$

素因数の和:421

約数の個数: 32

約数和(自身を含む): 32296960

約数和(自身を除く): 10656511

約数列:

[1, 3, 19, 31, 37, 57, 93, 111, 331, 589, 703, 993, 1147, 1767, 2109, 3441, 6289, 10261, 12247, 18867, 21793, 30783, 36741, 65379, 194959, 232693, 379657, 584877, 698079, 1138971, 7213483, 21640449]

約数ペア:

[(1, 21640449), (3, 7213483), (19, 1138971), (31, 698079), (37, 584877), (57, 379657), (93, 232693), (111, 194959), (331, 65379), (589, 36741), (703, 30783), (993, 21793), (1147, 18867), (1767, 12247), (2109, 10261), (3441, 6289)]