21721203

素因数分解:

$3^4\times 7^1\times {\mathrm{29}}^1\times {\mathrm{1321}}^1$

素因数の和:1369

約数の個数: 40

約数和(自身を含む): 38390880

約数和(自身を除く): 16669677

約数列:

[1, 3, 7, 9, 21, 27, 29, 63, 81, 87, 189, 203, 261, 567, 609, 783, 1321, 1827, 2349, 3963, 5481, 9247, 11889, 16443, 27741, 35667, 38309, 83223, 107001, 114927, 249669, 268163, 344781, 749007, 804489, 1034343, 2413467, 3103029, 7240401, 21721203]

約数ペア:

[(1, 21721203), (3, 7240401), (7, 3103029), (9, 2413467), (21, 1034343), (27, 804489), (29, 749007), (63, 344781), (81, 268163), (87, 249669), (189, 114927), (203, 107001), (261, 83223), (567, 38309), (609, 35667), (783, 27741), (1321, 16443), (1827, 11889), (2349, 9247), (3963, 5481)]