21503895

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{17}}^1\times {\mathrm{1721}}^1$

素因数の和:1760

約数の個数: 48

約数和(自身を含む): 42402528

約数和(自身を除く): 20898633

約数列:

[1, 3, 5, 7, 15, 17, 21, 35, 49, 51, 85, 105, 119, 147, 245, 255, 357, 595, 735, 833, 1721, 1785, 2499, 4165, 5163, 8605, 12047, 12495, 25815, 29257, 36141, 60235, 84329, 87771, 146285, 180705, 204799, 252987, 421645, 438855, 614397, 1023995, 1264935, 1433593, 3071985, 4300779, 7167965, 21503895]

約数ペア:

[(1, 21503895), (3, 7167965), (5, 4300779), (7, 3071985), (15, 1433593), (17, 1264935), (21, 1023995), (35, 614397), (49, 438855), (51, 421645), (85, 252987), (105, 204799), (119, 180705), (147, 146285), (245, 87771), (255, 84329), (357, 60235), (595, 36141), (735, 29257), (833, 25815), (1721, 12495), (1785, 12047), (2499, 8605), (4165, 5163)]