21291985

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{97}}^1\times {\mathrm{307}}^1$

素因数の和:433

約数の個数: 32

約数和(自身を含む): 30425472

約数和(自身を除く): 9133487

約数列:

[1, 5, 11, 13, 55, 65, 97, 143, 307, 485, 715, 1067, 1261, 1535, 3377, 3991, 5335, 6305, 13871, 16885, 19955, 29779, 43901, 69355, 148895, 219505, 327569, 387127, 1637845, 1935635, 4258397, 21291985]

約数ペア:

[(1, 21291985), (5, 4258397), (11, 1935635), (13, 1637845), (55, 387127), (65, 327569), (97, 219505), (143, 148895), (307, 69355), (485, 43901), (715, 29779), (1067, 19955), (1261, 16885), (1535, 13871), (3377, 6305), (3991, 5335)]