20347985

素因数分解:

$5^1\times 7^2\times {\mathrm{23}}^2\times {\mathrm{157}}^1$

素因数の和:222

約数の個数: 36

約数和(自身を含む): 29881908

約数和(自身を除く): 9533923

約数列:

[1, 5, 7, 23, 35, 49, 115, 157, 161, 245, 529, 785, 805, 1099, 1127, 2645, 3611, 3703, 5495, 5635, 7693, 18055, 18515, 25277, 25921, 38465, 83053, 126385, 129605, 176939, 415265, 581371, 884695, 2906855, 4069597, 20347985]

約数ペア:

[(1, 20347985), (5, 4069597), (7, 2906855), (23, 884695), (35, 581371), (49, 415265), (115, 176939), (157, 129605), (161, 126385), (245, 83053), (529, 38465), (785, 25921), (805, 25277), (1099, 18515), (1127, 18055), (2645, 7693), (3611, 5635), (3703, 5495)]