21678189

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{83}}^1\times {\mathrm{181}}^1$

素因数の和:317

約数の個数: 32

約数和(自身を含む): 32532864

約数和(自身を除く): 10854675

約数列:

[1, 3, 13, 37, 39, 83, 111, 181, 249, 481, 543, 1079, 1443, 2353, 3071, 3237, 6697, 7059, 9213, 15023, 20091, 39923, 45069, 87061, 119769, 195299, 261183, 555851, 585897, 1667553, 7226063, 21678189]

約数ペア:

[(1, 21678189), (3, 7226063), (13, 1667553), (37, 585897), (39, 555851), (83, 261183), (111, 195299), (181, 119769), (249, 87061), (481, 45069), (543, 39923), (1079, 20091), (1443, 15023), (2353, 9213), (3071, 7059), (3237, 6697)]