21487921

素因数分解:

$7^3\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{79}}^1$

素因数の和:174

約数の個数: 32

約数和(自身を含む): 27776000

約数和(自身を除く): 6288079

約数列:

[1, 7, 13, 49, 61, 79, 91, 343, 427, 553, 637, 793, 1027, 2989, 3871, 4459, 4819, 5551, 7189, 20923, 27097, 33733, 38857, 50323, 62647, 236131, 271999, 352261, 438529, 1652917, 3069703, 21487921]

約数ペア:

[(1, 21487921), (7, 3069703), (13, 1652917), (49, 438529), (61, 352261), (79, 271999), (91, 236131), (343, 62647), (427, 50323), (553, 38857), (637, 33733), (793, 27097), (1027, 20923), (2989, 7189), (3871, 5551), (4459, 4819)]